This document provides an overview of cell structure and function. It discusses the key discoveries and principles of cell theory. The document then focuses on cell membranes, describing their structure using the fluid mosaic model. It explains that membranes are made of a phospholipid bilayer and integral and peripheral proteins. Various types of transport across the membrane are also summarized, including passive transport mechanisms like diffusion and osmosis as well as active transport like the sodium-potassium pump. Bulk transport of materials into and out of cells through endocytosis and exocytosis is briefly covered.
Cell Membrane And Transport system.pptxAninditaDeb10
The document discusses the structure and functions of the cell membrane. It describes the fluid mosaic model of the cell membrane, which is made up of a phospholipid bilayer. Factors like temperature and cholesterol content affect the fluidity of the membrane. The membrane acts as a selective barrier and allows transport through passive diffusion, facilitated diffusion, osmosis, and active transport like the sodium-potassium pump. It transports nutrients, waste, and sends signals to allow cell-cell communication and signaling.
This document discusses cell membrane transport. It begins by defining the components of the cell membrane, including the phospholipid bilayer and embedded proteins. It then describes different types of specialized cell membranes and membrane junctions that allow communication between cells. The document outlines two main methods of transport across the cell membrane: passive transport, which requires no energy, and active transport, which requires energy. It provides details on diffusion, osmosis, facilitated diffusion, and filtration as examples of passive transport. For active transport, it discusses solute pumping and bulk transport mechanisms like exocytosis and endocytosis.
This document summarizes various mechanisms of transport across cell membranes. It discusses passive transport mechanisms like simple diffusion, facilitated diffusion, and osmosis which do not require energy. It also discusses active transport mechanisms like primary active transport which use energy in the form of ATP to transport molecules against their concentration gradient. These include protein pumps like the sodium-potassium pump. It describes other active transport mechanisms like secondary active transport which couple the transport of one substance to the transport of another. The document provides examples of different transport mechanisms and their biological significance for cellular function and homeostasis.
The document summarizes key aspects of cell membrane structure and function. It describes the fluid mosaic model, including that membranes are made of phospholipids, cholesterol, proteins and carbohydrates. It explains different types of membrane transport - diffusion, facilitated diffusion, osmosis, active transport. Diffusion and osmosis rely on concentration gradients but active transport works against gradients using protein carriers and ATP. Membrane transport controls exchange of materials and signals between cells and their environments.
The cell membrane regulates what enters and exits the cell. It is a phospholipid bilayer with proteins embedded. Materials move across the membrane through passive diffusion, facilitated diffusion, or active transport using protein channels and pumps. Water moves across the membrane through osmosis to equalize its concentration gradient. Large particles enter through endocytosis using vesicles formed from the membrane.
The document summarizes key aspects of biological membranes and transport across membranes. It describes membranes as selectively permeable barriers composed of lipids and proteins. Transport can occur passively via diffusion, facilitated diffusion, and osmosis without energy expenditure. Active transport moves molecules against gradients and requires energy input via primary active transport using ATP or secondary active transport coupling to ion gradients. Larger molecules traverse membranes within vesicles through endocytosis and exocytosis.
This document discusses the structure and function of the plasma membrane. It notes that the plasma membrane is selectively permeable and controls what enters and exits the cell through passive and active transport mechanisms. The plasma membrane is made up of a phospholipid bilayer with integral and peripheral proteins. Passive transport mechanisms like simple diffusion, facilitated diffusion, and osmosis move substances down concentration gradients without energy expenditure. Active transport mechanisms move substances against concentration gradients using energy from ATP.
The document provides information about the basic structures and functions of plant and animal cells. It describes the key components of the cell and their roles, including the cell membrane, cell wall, nucleus, mitochondria, endoplasmic reticulum, ribosomes, Golgi apparatus, plastids, vacuoles, and centrioles. It also compares the structures of plant and animal cells and explains various processes involved in cell transport, such as diffusion, osmosis, and active transport.
Cell Membrane And Transport system.pptxAninditaDeb10
The document discusses the structure and functions of the cell membrane. It describes the fluid mosaic model of the cell membrane, which is made up of a phospholipid bilayer. Factors like temperature and cholesterol content affect the fluidity of the membrane. The membrane acts as a selective barrier and allows transport through passive diffusion, facilitated diffusion, osmosis, and active transport like the sodium-potassium pump. It transports nutrients, waste, and sends signals to allow cell-cell communication and signaling.
This document discusses cell membrane transport. It begins by defining the components of the cell membrane, including the phospholipid bilayer and embedded proteins. It then describes different types of specialized cell membranes and membrane junctions that allow communication between cells. The document outlines two main methods of transport across the cell membrane: passive transport, which requires no energy, and active transport, which requires energy. It provides details on diffusion, osmosis, facilitated diffusion, and filtration as examples of passive transport. For active transport, it discusses solute pumping and bulk transport mechanisms like exocytosis and endocytosis.
This document summarizes various mechanisms of transport across cell membranes. It discusses passive transport mechanisms like simple diffusion, facilitated diffusion, and osmosis which do not require energy. It also discusses active transport mechanisms like primary active transport which use energy in the form of ATP to transport molecules against their concentration gradient. These include protein pumps like the sodium-potassium pump. It describes other active transport mechanisms like secondary active transport which couple the transport of one substance to the transport of another. The document provides examples of different transport mechanisms and their biological significance for cellular function and homeostasis.
The document summarizes key aspects of cell membrane structure and function. It describes the fluid mosaic model, including that membranes are made of phospholipids, cholesterol, proteins and carbohydrates. It explains different types of membrane transport - diffusion, facilitated diffusion, osmosis, active transport. Diffusion and osmosis rely on concentration gradients but active transport works against gradients using protein carriers and ATP. Membrane transport controls exchange of materials and signals between cells and their environments.
The cell membrane regulates what enters and exits the cell. It is a phospholipid bilayer with proteins embedded. Materials move across the membrane through passive diffusion, facilitated diffusion, or active transport using protein channels and pumps. Water moves across the membrane through osmosis to equalize its concentration gradient. Large particles enter through endocytosis using vesicles formed from the membrane.
The document summarizes key aspects of biological membranes and transport across membranes. It describes membranes as selectively permeable barriers composed of lipids and proteins. Transport can occur passively via diffusion, facilitated diffusion, and osmosis without energy expenditure. Active transport moves molecules against gradients and requires energy input via primary active transport using ATP or secondary active transport coupling to ion gradients. Larger molecules traverse membranes within vesicles through endocytosis and exocytosis.
This document discusses the structure and function of the plasma membrane. It notes that the plasma membrane is selectively permeable and controls what enters and exits the cell through passive and active transport mechanisms. The plasma membrane is made up of a phospholipid bilayer with integral and peripheral proteins. Passive transport mechanisms like simple diffusion, facilitated diffusion, and osmosis move substances down concentration gradients without energy expenditure. Active transport mechanisms move substances against concentration gradients using energy from ATP.
The document provides information about the basic structures and functions of plant and animal cells. It describes the key components of the cell and their roles, including the cell membrane, cell wall, nucleus, mitochondria, endoplasmic reticulum, ribosomes, Golgi apparatus, plastids, vacuoles, and centrioles. It also compares the structures of plant and animal cells and explains various processes involved in cell transport, such as diffusion, osmosis, and active transport.
Transport through Cell Membrane including passive transport and Active transport ,special types of passive transport , Special types of active transport , Dynamic motors, lipid layer and Protein Layer
The document summarizes the structure and functions of cell membranes. It describes the fluid mosaic model, which states that membranes are made of phospholipids and proteins that can move about freely. Phospholipids form a bilayer with hydrophobic tails facing inward and hydrophilic heads outward. Membrane proteins are either integral proteins spanning the membrane or peripheral proteins attached to one surface. The document also explains various transport mechanisms like diffusion, facilitated diffusion, osmosis, active transport, and bulk transport across membranes.
Cell Structure and Function outlines key concepts in cell biology. It discusses that cells are the basic unit of life and were first observed by Robert Hooke in the 1600s. Theodor Schwann and Matthias Schleiden established cell theory in 1839, stating that all living things are made of cells, and Rudolf Virchow later added that all cells come from preexisting cells. All cells have a plasma membrane, cytoplasm, and organelles like the nucleus. Prokaryotic cells lack organelles while eukaryotic cells have organelles like the nucleus. The document then describes various organelle structures and functions like the endoplasmic reticulum, Golgi apparatus, mitochondria, and chloroplasts. It also covers
This document discusses various mechanisms of transport across cell membranes, including both passive and active transport. It describes the basic mechanisms of passive transport, such as simple diffusion through lipid and protein layers, facilitated diffusion, and special types of passive transport including bulk flow, filtration, and osmosis. Factors affecting the rate of diffusion like permeability, temperature, and concentration gradients are also covered. The document concludes by explaining active transport and various types of protein channels that regulate transport.
STEM General Biology 1: The Cells
Cell Theory
Cell Structures and Functions
Prokaryotes vs. Eukaryotes
Animal vs. Plant Cells
Cell Modification
Movement of Molecules in Cells
1. Cells are the smallest living units that make up all living things. All cells arise from preexisting cells according to cell theory.
2. Eukaryotic cells contain membrane-bound organelles and a nucleus, while prokaryotic cells like bacteria lack these structures. Key organelles include the nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, lysosomes, and vacuoles.
3. Molecules and ions move across the plasma membrane through passive transport mechanisms like diffusion, osmosis, and facilitated diffusion which require no energy, or through active transport which requires energy from processes like the sodium-potassium pump.
This document summarizes various methods of transporting substances across cell membranes, including:
1. Passive transport mechanisms like simple diffusion, facilitated diffusion, and osmosis that move substances down concentration gradients without energy expenditure.
2. Active transport processes like primary and secondary active transport that move substances against concentration gradients using energy, usually from ATP hydrolysis.
3. Vesicular transport mechanisms of endocytosis and exocytosis that move substances in or out of cells within vesicles formed from the cell membrane.
Membrane transport can occur passively through diffusion, osmosis, and facilitated diffusion which do not require energy, or actively through processes like ion pumps, cotransporters, and endocytosis/exocytosis which do require energy. Passive transport moves molecules along concentration gradients while active transport moves molecules against gradients using cellular energy from ATP. Cell membranes regulate the passage of substances in and out of cells through selective permeability and various transport mechanisms.
The plasma membrane is a selectively permeable bilayer that controls what enters and exits the cell. It is made up of lipids and proteins arranged in the fluid mosaic model. Membrane proteins perform important functions like transporting molecules across the membrane. The membrane must remain fluid to function properly and different organisms regulate membrane fluidity through adaptations in lipid composition. Transport across the membrane can occur through passive diffusion or active transport using membrane proteins.
The document provides an overview of cell structure and function. It discusses the key discoveries and principles of cell theory. The main components of cells are then described, including the plasma membrane, cytoplasm, cytoskeleton, organelles, and cell walls. Specific organelles like the nucleus, mitochondria, chloroplasts, and Golgi apparatus are explained. The processes of passive transport, active transport, endocytosis, and exocytosis are also summarized.
1. The plasma membrane is selectively permeable, allowing passage of some substances and restricting others based on size, charge, shape, and solubility.
2. Transport across the membrane can be passive via diffusion or filtration, requiring no ATP, or active via carrier-mediated transport or vesicular transport, requiring ATP to move against gradients.
3. Diffusion is the passive movement of particles from high to low concentration down a gradient, and can occur directly through the lipid bilayer or through channel proteins.
B.Sc. Microbiology/Biotech II Cell biology and Genetics Unit 3 cell transportRai University
The document discusses cell membranes and transport. It begins by describing the basic components of cell membranes, including that they are made of lipids and proteins. It notes that plant, fungi, and bacteria cells have cell walls in addition to cell membranes. The document then discusses the functions of cell membranes as gatekeepers that regulate transport into and out of cells and help maintain homeostasis. It describes different types of transport across cell membranes, including passive transport mechanisms like diffusion and facilitated diffusion, and active transport which requires energy. It provides examples of transport proteins involved in these processes. The document concludes by summarizing endocytosis and exocytosis for transporting larger molecules and macromolecules across cell membranes.
The cell membrane (also known as the plasma membrane or cytoplasmic membrane) is a biological membrane that separates the interior of all cells from the outside environment. The cell membrane is selectively permeable to ions and organic molecules and controls the movement of substances in and out of cells.The basic function of the cell membrane is to protect the cell from its surroundings. It consists of the phospholipid bilayer with embedded proteins. Cell membranes are involved in a variety of cellular processes such as cell adhesion, ion conductivity and cell signalling and serve as the attachment surface for several extracellular structures, including the cell wall, glycocalyx, and intracellular cytoskeleton.
- Cells are the smallest living units that make up all living things. All cells come from pre-existing cells.
- Cells can be either prokaryotic or eukaryotic. Eukaryotic cells contain a nucleus and membrane-bound organelles, while prokaryotic cells do not have a nucleus or membrane-bound organelles.
- Organelles such as the nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, lysosomes, and vacuoles allow cells to carry out specialized functions and processes like respiration, photosynthesis, protein transport, and waste removal.
- Cells are the smallest living units that make up all living things. All cells come from pre-existing cells.
- Cells can be either prokaryotic or eukaryotic. Eukaryotic cells contain membrane-bound organelles and a nucleus, while prokaryotic cells do not.
- Organelles such as the nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, lysosomes, and vacuoles allow cells to carry out specialized functions and processes like respiration, photosynthesis, protein transport, and waste removal.
- Molecules can move across the cell membrane through passive transport mechanisms like diffusion, osmosis, and facilitated diffusion which do not require
- Cells are the smallest living units that make up all living things. All cells come from pre-existing cells.
- Cells can be either prokaryotic or eukaryotic. Eukaryotic cells contain a nucleus and membrane-bound organelles, while prokaryotic cells do not have a nucleus or membrane-bound organelles.
- Organelles such as the nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles perform specific functions to keep the cell alive.
- Cells are the smallest living units that make up all living things. All cells come from pre-existing cells.
- Cells can be either prokaryotic or eukaryotic. Eukaryotic cells contain membrane-bound organelles and a nucleus, while prokaryotic cells do not.
- Organelles such as the nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, lysosomes, and vacuoles allow cells to carry out specialized functions and processes like respiration, photosynthesis, protein transport, and waste removal.
- Molecules can move across the cell membrane through passive transport mechanisms like diffusion, osmosis, and facilitated diffusion which do not require
This document discusses four mechanisms of transport across cell membranes: diffusion, osmosis, facilitated transport, and active transport. Diffusion is the passive movement of molecules from an area of high concentration to low concentration. Osmosis is a type of diffusion where water moves through a semi-permeable membrane from high to low concentration. Facilitated transport uses carrier proteins to transport molecules along a concentration gradient. Active transport transports molecules against a concentration gradient and requires energy from ATP.
Unit I, chapter-2 Cellular level of organization.Audumbar Mali
The document provides an overview of the structure and function of eukaryotic cells. It discusses the key parts of the cell including the plasma membrane, cytoplasm, organelles like the nucleus, mitochondria and Golgi apparatus. It also describes cellular transport mechanisms like passive diffusion and active transport. The summary is as follows:
The document discusses the basic structure and functions of eukaryotic cells. It describes the key parts of the cell including the plasma membrane, cytoplasm and organelles. It also explains cellular transport mechanisms such as passive and active transport that allow movement of substances into and out of cells.
Mansoor Ahmed presented on the topic of thermal transitions in polymers to Miss Habiba Taj Sahiba on July 23, 2020 at the University of Balochistan in Quetta. The presentation discussed glass transition temperature (Tg), crystalline melting point (Tm), and factors that affect Tg and Tm such as polymer structure, molecular weight, and intermolecular interactions. It also described techniques for analyzing polymer thermal behavior including differential scanning calorimetry and thermogravimetric analysis.
Mansoor Ahmed presented on the topic of ozone depletion to Miss Sadaf Ashraf at the University of Balochistan in Quetta on July 20, 2020. He discussed that ozone, composed of three oxygen atoms, protects life on Earth by absorbing UV radiation. However, chlorofluorocarbons and other chemicals released by industries are depleting the ozone layer. When UV hits these chemicals, chlorine atoms are released which can destroy over 100,000 ozone molecules each. This depletion damages human health, agriculture, plants, animals and materials. The presentation concluded that controlling emissions from air conditioners, refrigerators and vehicles is needed to stop ozone depletion and protect life on Earth.
Transport through Cell Membrane including passive transport and Active transport ,special types of passive transport , Special types of active transport , Dynamic motors, lipid layer and Protein Layer
The document summarizes the structure and functions of cell membranes. It describes the fluid mosaic model, which states that membranes are made of phospholipids and proteins that can move about freely. Phospholipids form a bilayer with hydrophobic tails facing inward and hydrophilic heads outward. Membrane proteins are either integral proteins spanning the membrane or peripheral proteins attached to one surface. The document also explains various transport mechanisms like diffusion, facilitated diffusion, osmosis, active transport, and bulk transport across membranes.
Cell Structure and Function outlines key concepts in cell biology. It discusses that cells are the basic unit of life and were first observed by Robert Hooke in the 1600s. Theodor Schwann and Matthias Schleiden established cell theory in 1839, stating that all living things are made of cells, and Rudolf Virchow later added that all cells come from preexisting cells. All cells have a plasma membrane, cytoplasm, and organelles like the nucleus. Prokaryotic cells lack organelles while eukaryotic cells have organelles like the nucleus. The document then describes various organelle structures and functions like the endoplasmic reticulum, Golgi apparatus, mitochondria, and chloroplasts. It also covers
This document discusses various mechanisms of transport across cell membranes, including both passive and active transport. It describes the basic mechanisms of passive transport, such as simple diffusion through lipid and protein layers, facilitated diffusion, and special types of passive transport including bulk flow, filtration, and osmosis. Factors affecting the rate of diffusion like permeability, temperature, and concentration gradients are also covered. The document concludes by explaining active transport and various types of protein channels that regulate transport.
STEM General Biology 1: The Cells
Cell Theory
Cell Structures and Functions
Prokaryotes vs. Eukaryotes
Animal vs. Plant Cells
Cell Modification
Movement of Molecules in Cells
1. Cells are the smallest living units that make up all living things. All cells arise from preexisting cells according to cell theory.
2. Eukaryotic cells contain membrane-bound organelles and a nucleus, while prokaryotic cells like bacteria lack these structures. Key organelles include the nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, lysosomes, and vacuoles.
3. Molecules and ions move across the plasma membrane through passive transport mechanisms like diffusion, osmosis, and facilitated diffusion which require no energy, or through active transport which requires energy from processes like the sodium-potassium pump.
This document summarizes various methods of transporting substances across cell membranes, including:
1. Passive transport mechanisms like simple diffusion, facilitated diffusion, and osmosis that move substances down concentration gradients without energy expenditure.
2. Active transport processes like primary and secondary active transport that move substances against concentration gradients using energy, usually from ATP hydrolysis.
3. Vesicular transport mechanisms of endocytosis and exocytosis that move substances in or out of cells within vesicles formed from the cell membrane.
Membrane transport can occur passively through diffusion, osmosis, and facilitated diffusion which do not require energy, or actively through processes like ion pumps, cotransporters, and endocytosis/exocytosis which do require energy. Passive transport moves molecules along concentration gradients while active transport moves molecules against gradients using cellular energy from ATP. Cell membranes regulate the passage of substances in and out of cells through selective permeability and various transport mechanisms.
The plasma membrane is a selectively permeable bilayer that controls what enters and exits the cell. It is made up of lipids and proteins arranged in the fluid mosaic model. Membrane proteins perform important functions like transporting molecules across the membrane. The membrane must remain fluid to function properly and different organisms regulate membrane fluidity through adaptations in lipid composition. Transport across the membrane can occur through passive diffusion or active transport using membrane proteins.
The document provides an overview of cell structure and function. It discusses the key discoveries and principles of cell theory. The main components of cells are then described, including the plasma membrane, cytoplasm, cytoskeleton, organelles, and cell walls. Specific organelles like the nucleus, mitochondria, chloroplasts, and Golgi apparatus are explained. The processes of passive transport, active transport, endocytosis, and exocytosis are also summarized.
1. The plasma membrane is selectively permeable, allowing passage of some substances and restricting others based on size, charge, shape, and solubility.
2. Transport across the membrane can be passive via diffusion or filtration, requiring no ATP, or active via carrier-mediated transport or vesicular transport, requiring ATP to move against gradients.
3. Diffusion is the passive movement of particles from high to low concentration down a gradient, and can occur directly through the lipid bilayer or through channel proteins.
B.Sc. Microbiology/Biotech II Cell biology and Genetics Unit 3 cell transportRai University
The document discusses cell membranes and transport. It begins by describing the basic components of cell membranes, including that they are made of lipids and proteins. It notes that plant, fungi, and bacteria cells have cell walls in addition to cell membranes. The document then discusses the functions of cell membranes as gatekeepers that regulate transport into and out of cells and help maintain homeostasis. It describes different types of transport across cell membranes, including passive transport mechanisms like diffusion and facilitated diffusion, and active transport which requires energy. It provides examples of transport proteins involved in these processes. The document concludes by summarizing endocytosis and exocytosis for transporting larger molecules and macromolecules across cell membranes.
The cell membrane (also known as the plasma membrane or cytoplasmic membrane) is a biological membrane that separates the interior of all cells from the outside environment. The cell membrane is selectively permeable to ions and organic molecules and controls the movement of substances in and out of cells.The basic function of the cell membrane is to protect the cell from its surroundings. It consists of the phospholipid bilayer with embedded proteins. Cell membranes are involved in a variety of cellular processes such as cell adhesion, ion conductivity and cell signalling and serve as the attachment surface for several extracellular structures, including the cell wall, glycocalyx, and intracellular cytoskeleton.
- Cells are the smallest living units that make up all living things. All cells come from pre-existing cells.
- Cells can be either prokaryotic or eukaryotic. Eukaryotic cells contain a nucleus and membrane-bound organelles, while prokaryotic cells do not have a nucleus or membrane-bound organelles.
- Organelles such as the nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, lysosomes, and vacuoles allow cells to carry out specialized functions and processes like respiration, photosynthesis, protein transport, and waste removal.
- Cells are the smallest living units that make up all living things. All cells come from pre-existing cells.
- Cells can be either prokaryotic or eukaryotic. Eukaryotic cells contain membrane-bound organelles and a nucleus, while prokaryotic cells do not.
- Organelles such as the nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, lysosomes, and vacuoles allow cells to carry out specialized functions and processes like respiration, photosynthesis, protein transport, and waste removal.
- Molecules can move across the cell membrane through passive transport mechanisms like diffusion, osmosis, and facilitated diffusion which do not require
- Cells are the smallest living units that make up all living things. All cells come from pre-existing cells.
- Cells can be either prokaryotic or eukaryotic. Eukaryotic cells contain a nucleus and membrane-bound organelles, while prokaryotic cells do not have a nucleus or membrane-bound organelles.
- Organelles such as the nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles perform specific functions to keep the cell alive.
- Cells are the smallest living units that make up all living things. All cells come from pre-existing cells.
- Cells can be either prokaryotic or eukaryotic. Eukaryotic cells contain membrane-bound organelles and a nucleus, while prokaryotic cells do not.
- Organelles such as the nucleus, mitochondria, chloroplasts, endoplasmic reticulum, Golgi apparatus, lysosomes, and vacuoles allow cells to carry out specialized functions and processes like respiration, photosynthesis, protein transport, and waste removal.
- Molecules can move across the cell membrane through passive transport mechanisms like diffusion, osmosis, and facilitated diffusion which do not require
This document discusses four mechanisms of transport across cell membranes: diffusion, osmosis, facilitated transport, and active transport. Diffusion is the passive movement of molecules from an area of high concentration to low concentration. Osmosis is a type of diffusion where water moves through a semi-permeable membrane from high to low concentration. Facilitated transport uses carrier proteins to transport molecules along a concentration gradient. Active transport transports molecules against a concentration gradient and requires energy from ATP.
Unit I, chapter-2 Cellular level of organization.Audumbar Mali
The document provides an overview of the structure and function of eukaryotic cells. It discusses the key parts of the cell including the plasma membrane, cytoplasm, organelles like the nucleus, mitochondria and Golgi apparatus. It also describes cellular transport mechanisms like passive diffusion and active transport. The summary is as follows:
The document discusses the basic structure and functions of eukaryotic cells. It describes the key parts of the cell including the plasma membrane, cytoplasm and organelles. It also explains cellular transport mechanisms such as passive and active transport that allow movement of substances into and out of cells.
Mansoor Ahmed presented on the topic of thermal transitions in polymers to Miss Habiba Taj Sahiba on July 23, 2020 at the University of Balochistan in Quetta. The presentation discussed glass transition temperature (Tg), crystalline melting point (Tm), and factors that affect Tg and Tm such as polymer structure, molecular weight, and intermolecular interactions. It also described techniques for analyzing polymer thermal behavior including differential scanning calorimetry and thermogravimetric analysis.
Mansoor Ahmed presented on the topic of ozone depletion to Miss Sadaf Ashraf at the University of Balochistan in Quetta on July 20, 2020. He discussed that ozone, composed of three oxygen atoms, protects life on Earth by absorbing UV radiation. However, chlorofluorocarbons and other chemicals released by industries are depleting the ozone layer. When UV hits these chemicals, chlorine atoms are released which can destroy over 100,000 ozone molecules each. This depletion damages human health, agriculture, plants, animals and materials. The presentation concluded that controlling emissions from air conditioners, refrigerators and vehicles is needed to stop ozone depletion and protect life on Earth.
Mansoor Ahmed presented on the topic of ozone depletion to Miss Sadaf Ashraf at the University of Balochistan on July 20, 2020. The presentation discussed that ozone is a gas composed of three oxygen atoms that protects life on Earth by absorbing UV radiation. Ozone depletion occurs when chlorofluorocarbons released by industries react with ozone in the stratosphere and release chlorine atoms that destroy over 100,000 ozone molecules each. If ozone depletion continues unchecked, it will damage human health, agriculture, plants, animals and materials through increased UV radiation exposure. The presentation concluded by emphasizing the need to control emissions and activities that cause ozone depletion to prevent harm to life on Earth.
The document discusses nuclear structure and transport. Some key points:
- The nucleus is surrounded by a double membrane nuclear envelope containing pores that regulate transport of molecules and macromolecules.
- The nucleus contains subcompartments like the nucleolus and nuclear speckles that carry out processes like rRNA synthesis and mRNA splicing.
- Chromosomes occupy distinct territories within the nucleus and nuclear transport of proteins and RNA involves receptor-mediated passage through nuclear pore complexes, regulated by the Ran GTPase system.
The document discusses electrophilic addition reactions of alkenes. It introduces the topic and provides details about reaction mechanisms and kinetics. Specifically, it explains that (1) alkenes undergo addition reactions where an electrophile attacks the carbon-carbon double bond, (2) the reaction follows a two-step mechanism where the double bond first attacks the electrophile to form a carbocation intermediate which is then attacked by a halide ion, and (3) reaction rates increase with increasing alkyl substituents on the alkene and decreasing hydrogen-halogen bond strength as it stabilizes the carbocation intermediate.
This document provides an introduction to the course "Introduction to Biochemistry". It discusses the following key points:
1) Biochemistry is the study of the chemical basis of life, examining the molecules that make up living cells and organisms.
2) The major biomolecules that will be covered are carbohydrates, lipids, proteins, and nucleic acids.
3) Students will learn about the structure and functions of these biomolecules as well as basic biochemical processes in cells like respiration and protein synthesis.
4) The course will involve lectures, group discussions, and studying from recommended textbooks to help students understand and apply the concepts of biochemistry.
Beyond Degrees - Empowering the Workforce in the Context of Skills-First.pptxEduSkills OECD
Iván Bornacelly, Policy Analyst at the OECD Centre for Skills, OECD, presents at the webinar 'Tackling job market gaps with a skills-first approach' on 12 June 2024
This document provides an overview of wound healing, its functions, stages, mechanisms, factors affecting it, and complications.
A wound is a break in the integrity of the skin or tissues, which may be associated with disruption of the structure and function.
Healing is the body’s response to injury in an attempt to restore normal structure and functions.
Healing can occur in two ways: Regeneration and Repair
There are 4 phases of wound healing: hemostasis, inflammation, proliferation, and remodeling. This document also describes the mechanism of wound healing. Factors that affect healing include infection, uncontrolled diabetes, poor nutrition, age, anemia, the presence of foreign bodies, etc.
Complications of wound healing like infection, hyperpigmentation of scar, contractures, and keloid formation.
Main Java[All of the Base Concepts}.docxadhitya5119
This is part 1 of my Java Learning Journey. This Contains Custom methods, classes, constructors, packages, multithreading , try- catch block, finally block and more.
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
Leveraging Generative AI to Drive Nonprofit InnovationTechSoup
In this webinar, participants learned how to utilize Generative AI to streamline operations and elevate member engagement. Amazon Web Service experts provided a customer specific use cases and dived into low/no-code tools that are quick and easy to deploy through Amazon Web Service (AWS.)
हिंदी वर्णमाला पीपीटी, hindi alphabet PPT presentation, hindi varnamala PPT, Hindi Varnamala pdf, हिंदी स्वर, हिंदी व्यंजन, sikhiye hindi varnmala, dr. mulla adam ali, hindi language and literature, hindi alphabet with drawing, hindi alphabet pdf, hindi varnamala for childrens, hindi language, hindi varnamala practice for kids, https://www.drmullaadamali.com
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPRAHUL
This Dissertation explores the particular circumstances of Mirzapur, a region located in the
core of India. Mirzapur, with its varied terrains and abundant biodiversity, offers an optimal
environment for investigating the changes in vegetation cover dynamics. Our study utilizes
advanced technologies such as GIS (Geographic Information Systems) and Remote sensing to
analyze the transformations that have taken place over the course of a decade.
The complex relationship between human activities and the environment has been the focus
of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
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Chapter wise All Notes of First year Basic Civil Engineering.pptxDenish Jangid
Chapter wise All Notes of First year Basic Civil Engineering
Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
Levelling: Instrument used Object of levelling, Methods of levelling in brief, and Contour maps.
Chapter 4
Buildings: Selection of site for Buildings, Layout of Building Plan, Types of buildings, Plinth area, carpet area, floor space index, Introduction to building byelaws, concept of sun light & ventilation. Components of Buildings & their functions, Basic concept of R.C.C., Introduction to types of foundation
Chapter 5
Transportation: Introduction to Transportation Engineering; Traffic and Road Safety: Types and Characteristics of Various Modes of Transportation; Various Road Traffic Signs, Causes of Accidents and Road Safety Measures.
Chapter 6
Environmental Engineering: Environmental Pollution, Environmental Acts and Regulations, Functional Concepts of Ecology, Basics of Species, Biodiversity, Ecosystem, Hydrological Cycle; Chemical Cycles: Carbon, Nitrogen & Phosphorus; Energy Flow in Ecosystems.
Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
Text Books:
1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
3. Discovery of Cell
3
• Robert Hooke (mid-1600s)
– Observed sliver of cork
– Saw “row of empty boxes”
– Coined the term cell
4. Cell Theory
4
• (1839)Theodor Schwann & Matthias Schleiden
“ all living things are made of cells”
• (50 yrs. later) Rudolf Virchow
“all cells come from cells”
5. 5
• All living things are made of cells
• Smallest living unit of structure and
function of all organisms is the cell
• All cells arise from preexisting cells
(this principle discarded the idea of
spontaneous generation)
Principles of Cell Theory
8. 8
Characteristics of All Cells
• A surrounding membrane
• Protoplasm – cell contents in thick fluid
• Organelles – structures for cell function
• Control center with DNA
10. Plasma Membrane
10
• In 1895, Ernest Overton proposed that cell
membranes were made of lipids. The lipid
bilayer hypothesis, proposed in 1925 by Gorter
and Grendel, Boundary that separates the
living cell from it’s non-living surroundings.
• Phospholipid bilayer
• Amphipathic - having both:
hydrophilic heads
hydrophobic tails
• ~8 nm thick
• Is a dynamic structure
Phospholipid
11. 11
Membrane Structure
The fluid mosaic model of membrane structure has two
components:
1. Phospholipids arranged in a bilayer
2. Globular Proteins inserted in the lipid bilayer
15. 15
Membrane Structure
• Membrane structure is visible using an
electron microscope.
• Transmission electron microscopes (TEM)
can show the 2 layers of a membrane.
• Freeze-fracturing techniques separate the
layers and reveal membrane proteins.
20. 20
1. Phospholipids
Phospholipid Structure (Chapter 3)
-glycerol – a 3-carbon polyalcohol acting
as a backbone for the phospholipid
-2 fatty acids attached to the glycerol
-phosphate group attached to the
glycerol
21. 21
1. Phospholipids
The fatty acids are nonpolar chains of
carbon and hydrogen.
-Their nonpolar nature makes them
hydrophobic (“water-fearing”).
-The phosphate group is polar and
hydrophilic (“water-loving”).
22. 22
1. Phospholipids
The partially hydrophilic, partially
hydrophobic phospholipid
spontaneously forms a bilayer:
-fatty acids are on the inside
-phosphate groups are on both
surfaces of the bilayer
24. 24
1. Phospholipids
•Phospholipid bilayers are fluid:
- Hydrogen bonding of water holds the 2
layers together
- Individual phospholipids and unanchored
proteins can move laterally through the
membrane
25. 25
1. Phospholipids
•Phospholipid bilayers are fluid:
- Saturated fatty acids make the membrane
less fluid than unsaturated fatty acids
- Cholesterols make the membrane more rigid
- Warm temperatures make the membrane
more fluid than cold temperatures
32. 32
Membrane Proteins
• Two types of membrane proteins
- Classified by how they are associated with
the membrane
1. Peripheral membrane proteins
2. Integral membrane proteins
33. 33
Membrane Proteins
1. Peripheral membrane proteins
• Anchored to a phospholipid in one layer
of the membrane
• on the intracellular or extracellular face of the
membrane
• Possess nonpolar regions that are
inserted in the lipid bilayer
• Free to move throughout one layer of the
bilayer
35. 35
Membrane Proteins
2. Integral membrane proteins
• Span the lipid bilayer (transmembrane
proteins)
• Nonpolar regions of the protein are
embedded in the interior of the bilayer
- Transmembrane Domain
• Polar regions of the protein protrude from
both sides of the bilayer
37. 37
Membrane Proteins
• Integral proteins possess at least one
transmembrane domain
- Region of the protein containing hydrophobic
amino acids
- Spans the lipid bilayer
- Usually alpha-helices
- Many receptors are integral proteins
39. 39
Membrane Proteins
• Extensive nonpolar regions within a
transmembrane protein can create a pore
through the membrane.
• sheets in the protein secondary structure
form a cylinder called a -barrel
• -barrel interior is polar and allows water and
small polar molecules to pass through the
membrane
41. 41
Membrane Transport
• Motion of substances in and out of the cell
• Cell membranes are Selectively
permeable
• Two Types of Transport Mechanisms:
1. Passive Transport
2. Active Transport
42. 42
Membrane Transport
• Passive transport is movement of
molecules through the membrane in which
no energy is required from the cell
• Active transport requires energy
expenditure by the cell
43. 43
1. Passive Transport
• Passive transport is movement of molecules
through the membrane in which no energy is
required from the cell
• Molecules move in response to a
concentration gradient
- A concentration gradient is a difference
between the concentration on one side of the
membrane and that on the other side
• Passive transport mechanisms only
movement substances along the
concentration gradient
44. 44
1. Passive Transport
• Passive transport mechanisms only
movement substances along the
concentration gradient:
- Substances move from an area of high
concentration to an area of low
concentration
44
45. 45
1. Passive Transport
• Mechanisms of Passive Transport:
1. Diffusion
- movement of solute molecules from high solute
concentration to low solute concentration
2. Osmosis
- movement of solvent water from high solvent
concentration to low solvent concentration
46. 46
1. Passive Transport
• Diffusion is movement of solute
molecules from high concentration to low
concentration
47. 47
1. Passive Transport
• There are two types of diffusion
1. Simple Diffusion
2. Facilitated Diffusion
48. 48
1. Passive Transport
1. Simple Diffusion
• Substances pass directly through
the cell membrane
• The cell membrane has limited
permeability to small polar
molecules, water, and ions
• The motion of water across the
membrane is known as osmosis
49. 49
1. Passive Transport
1. Simple Diffusion
• The rate (molecules/s) of simple
diffusion depends on the degree of
concentration gradient
• As the gradient reaches
equilibrium, diffusion slows
• At equilibrium, substances pass in
and out of the membrane at equal
rates
51. 51
1. Passive Transport
2. Facilitated Diffusion
• Substances must pass through
transported proteins to get through
the cell membrane
• The cell membrane is selectively
permeable
52. 52
Passive Transport
Carrier proteins bind to the molecule that
they transport across the membrane.
Facilitated diffusion is movement of a
molecule from high to low concentration
with the help of a carrier protein.
-is specific
-is passive
-saturates when all carriers are occupied
53. 53
Facilitated Diffusion
• Selective permeability: integral
membrane proteins allow the cell to be
selective about what passes through the
membrane.
- Channel proteins have a polar interior
allowing polar molecules to pass through.
- Carrier proteins bind to a specific molecule
to facilitate its passage.
54. 54
Channel Proteins
• Channel proteins include:
- ion channels allow the passage of
ions (charged atoms or molecules) which
are associated with water
- gated channels are opened or closed
in response to a stimulus
– the stimulus may be chemical or electrical
56. 56
Channel Proteins
• Ion channels allow the passage of ions
(charged atoms or molecules) across the
membrane
• A concentration gradient of ions across the
membrane creates a membrane potential
- a membrane potential is a charge
difference between the two sides of the
membrane
59. 59
1. Passive Transport
2. Facilitated Diffusion
• Is Specific - a carrier protein transports only
certain molecules or ions
• Is Passive - the direction of net movement is
determined by the relative concentrations on the
substances inside an outside the cell
• Has a Saturation Point - rate of
facilitated diffusion (molecules/s) depends on gradient
until all protein carriers are in use - saturation point
61. 61
Passive Transport
2. Osmosis
• Osmosis is the movement of water from
an area of high to low concentration of
water
- movement of water toward an area of high
solute concentration
- in osmosis, only water is able to pass
through the membrane
- Osmosis moves water through aquaporins
63. 63
Osmosis
• Osmotic concentration is determined by
the the concentration of all solutes in
solution
• Relative Osmotic Concentrations
• Hypertonic solutions: have a higher relative
solute concentration
• Hypotonic solutions: have a lower relative
solute concentration
• Isotonic Solutions: have equal relative
solute concentrations
67. 67
Osmosis
• Organisms can maintain osmotic balance
in different ways:
1. Some cells use extrusion in which
water is ejected through contractile
vacuoles.
2. Isosmotic regulation involves
keeping cells isotonic with their
environment.
3. Plant cells use turgor pressure to
push the cell membrane against the cell wall
and keep the cell rigid.
69. 69
2. Active Transport
Active transport
• Requires energy – ATP is used directly or
indirectly to fuel active transport
• Able to moves substances against the
concentration gradient - from low to high
concentration
- allows cells to store concentrated substances
• Requires the use of carrier proteins
70. 70
Active Transport
• Carrier proteins used in active transport
include:
-uniporters – move one molecule at a
time
-symporters – move two molecules in
the same direction
-antiporters – move two molecules in
opposite directions
71. 71
Active Transport
Sodium-potassium (Na+-K+) pump
• An active transport antiport mechanism
• Uses an antiporter to move 3 Na+ out of
the cell and 2 K+ into the cell
• ATP energy is used to change the
conformation of the carrier protein
• The affinity of the carrier protein for either
Na+ or K+ changes so the ions can be
carried across the membrane
72. 72
Active Transport
Sodium-potassium (Na+-K+) pump
• Used by animal cells to maintain a high
internal concentration of K+ ions and a low
internal concentration of Na+ ions
• Maintains a concentration gradient that is
used to power many other important
physiological process
77. 77
Active Transport
Coupled transport
• Uses the energy released when a
molecule moves by diffusion to supply
energy to active transport of a different
molecule
• A symporter is used
• Glucose-Na+ symporter captures the
energy from Na+ diffusion to move glucose
against a concentration gradient
79. 79
Bulk Transport
• Bulk transport of substances is
accomplished by
1. Endocytosis – movement of
substances into the cell
2. Exocytosis – movement of
materials out of the cell
80. 80
Bulk Transport
• Endocytosis occurs when the plasma
membrane envelops food particles and
liquids.
1. phagocytosis – the cell takes in
particulate matter
2. pinocytosis – the cell takes in only
fluid
3. receptor-mediated endocytosis –
specific molecules are taken in after they
bind to a receptor
84. 84
Bulk Transport
• Exocytosis occurs when material is
discharged from the cell.
• Vesicles in the cytoplasm fuse with the cell
membrane and release their contents to the
exterior of the cell
• Used in plants to export cell wall material
• Used in animals to secrete hormones,
neurotransmitters, digestive enzymes