The document discusses membrane transport mechanisms, including passive transport processes like simple diffusion, facilitated diffusion, and osmosis as well as active transport. It provides examples of sodium-potassium pumps, potassium channels, and vesicles. The importance of osmotic control in medical procedures is highlighted. Summaries of laboratory techniques for estimating osmolarity in tissues are also included.
Scope of Microbiology in Human Welfare Sazzad Khan
This document summarizes the important roles of microorganisms in various areas of human welfare like food production, animal feed, agriculture, industry, health, sanitation, pollution control and medicine. It outlines how microbes are used in the production of foods like bread, cheese, yogurt and beverages. It also describes how microbes fix nitrogen from the air in soil, produce natural fertilizers, decompose organic matter and release nutrients back into the soil. Additionally, it mentions uses of microbes in producing ethanol fuel, enzymes for detergents and textiles, and in biotechnology applications such as producing insulin, antibiotics and vaccines.
A salt is formed when a hydrogen ion from an acid is replaced by a metal ion or ammonium ion. The solubility of a salt in water is important for determining the suitable method for preparing it. Common soluble salts include ammonium, sodium, and potassium salts as well as most nitrate, chloride, and sulfate salts. However, some chloride, sulfate, and carbonate salts are insoluble such as silver chloride, lead chloride, mercury chloride, calcium sulfate, lead sulfate, barium sulfate, and most metal carbonates. Knowing whether a salt is soluble or insoluble is crucial before preparing it.
This document provides information on cultivating bacteria, including definitions, purposes, and requirements. It discusses cultivating bacteria in vitro for identification, antibiotic susceptibility testing, industrial uses, and research. The key requirements for in vitro cultivation are nutritional needs provided by culture media, temperature, gaseous atmosphere, and humidity. Various types of culture media are described based on consistency, oxygen requirements, and constituents. Selective, enriched, differential, and transport media are among the special types discussed.
The document discusses silicon feedstock for the solar industry. It covers the following key points in 3 sentences:
1) Most PV systems are built using crystalline silicon, which is the second most abundant element in the Earth's crust after oxygen. Metallurgical grade silicon is produced in large quantities but requires further refining for solar cell use.
2) Solar grade silicon is produced through chemical processes using trichlorosilane or silane gases, or through metallurgical upgrading of metallurgical grade silicon. The dominant production technology is the Siemens process using trichlorosilane.
3) The polysilicon industry is consolidating with the largest producers having over 100,000 metric
The document discusses photosynthesis and plant nutrition. It defines photosynthesis as the process by which plants use sunlight, water and carbon dioxide to produce oxygen and energy in the form of glucose. The requirements for photosynthesis are sunlight, chlorophyll, carbon dioxide and water. Leaves are adapted for photosynthesis through internal structures like stomata, mesophyll and vascular bundles that facilitate gas exchange and transport of nutrients and glucose. Limiting factors like light, carbon dioxide and temperature can affect the rate of photosynthesis. Deficiencies of nitrates and magnesium can stunt plant growth by limiting protein and chlorophyll production respectively.
Dokumen tersebut membahas tentang korosi pada logam besi. Faktor-faktor yang
mempengaruhi korosi dijelaskan seperti pengaruh udara dan lingkungan sekitar. Logam-
logam seperti tembaga dan seng dapat melindungi besi dari korosi, sementara pH larutan
juga berpengaruh terhadap laju korosi. Hipotesis yang diajukan terkait faktor-faktor yang
mempengaruhi korosi besi dan logam pen
This document discusses properties of common metal alloys. It defines an alloy as a metal combined with other elements to produce improved properties such as strength, hardness, and durability. Examples given are steel, an iron-carbon alloy, and brass, a copper-zinc alloy. The document then discusses how adding elements like chromium, vanadium, and nickel to steel can further enhance its properties for different applications. Bronze, a copper-tin alloy, is also described as being durable, weather-resistant, and commonly used in outdoor statues and architecture.
The document discusses the development and structure of the modern periodic table. It describes how scientists like Newlands, Mendeleev, and Moseley contributed to organizing the elements based on their atomic structure. The modern periodic table arranges elements in periods and groups based on proton number and electron configuration. It explains the properties and classification of different blocks of elements like metals, non-metals, metalloids, alkali metals, alkaline earth metals, halogens and noble gases.
Scope of Microbiology in Human Welfare Sazzad Khan
This document summarizes the important roles of microorganisms in various areas of human welfare like food production, animal feed, agriculture, industry, health, sanitation, pollution control and medicine. It outlines how microbes are used in the production of foods like bread, cheese, yogurt and beverages. It also describes how microbes fix nitrogen from the air in soil, produce natural fertilizers, decompose organic matter and release nutrients back into the soil. Additionally, it mentions uses of microbes in producing ethanol fuel, enzymes for detergents and textiles, and in biotechnology applications such as producing insulin, antibiotics and vaccines.
A salt is formed when a hydrogen ion from an acid is replaced by a metal ion or ammonium ion. The solubility of a salt in water is important for determining the suitable method for preparing it. Common soluble salts include ammonium, sodium, and potassium salts as well as most nitrate, chloride, and sulfate salts. However, some chloride, sulfate, and carbonate salts are insoluble such as silver chloride, lead chloride, mercury chloride, calcium sulfate, lead sulfate, barium sulfate, and most metal carbonates. Knowing whether a salt is soluble or insoluble is crucial before preparing it.
This document provides information on cultivating bacteria, including definitions, purposes, and requirements. It discusses cultivating bacteria in vitro for identification, antibiotic susceptibility testing, industrial uses, and research. The key requirements for in vitro cultivation are nutritional needs provided by culture media, temperature, gaseous atmosphere, and humidity. Various types of culture media are described based on consistency, oxygen requirements, and constituents. Selective, enriched, differential, and transport media are among the special types discussed.
The document discusses silicon feedstock for the solar industry. It covers the following key points in 3 sentences:
1) Most PV systems are built using crystalline silicon, which is the second most abundant element in the Earth's crust after oxygen. Metallurgical grade silicon is produced in large quantities but requires further refining for solar cell use.
2) Solar grade silicon is produced through chemical processes using trichlorosilane or silane gases, or through metallurgical upgrading of metallurgical grade silicon. The dominant production technology is the Siemens process using trichlorosilane.
3) The polysilicon industry is consolidating with the largest producers having over 100,000 metric
The document discusses photosynthesis and plant nutrition. It defines photosynthesis as the process by which plants use sunlight, water and carbon dioxide to produce oxygen and energy in the form of glucose. The requirements for photosynthesis are sunlight, chlorophyll, carbon dioxide and water. Leaves are adapted for photosynthesis through internal structures like stomata, mesophyll and vascular bundles that facilitate gas exchange and transport of nutrients and glucose. Limiting factors like light, carbon dioxide and temperature can affect the rate of photosynthesis. Deficiencies of nitrates and magnesium can stunt plant growth by limiting protein and chlorophyll production respectively.
Dokumen tersebut membahas tentang korosi pada logam besi. Faktor-faktor yang
mempengaruhi korosi dijelaskan seperti pengaruh udara dan lingkungan sekitar. Logam-
logam seperti tembaga dan seng dapat melindungi besi dari korosi, sementara pH larutan
juga berpengaruh terhadap laju korosi. Hipotesis yang diajukan terkait faktor-faktor yang
mempengaruhi korosi besi dan logam pen
This document discusses properties of common metal alloys. It defines an alloy as a metal combined with other elements to produce improved properties such as strength, hardness, and durability. Examples given are steel, an iron-carbon alloy, and brass, a copper-zinc alloy. The document then discusses how adding elements like chromium, vanadium, and nickel to steel can further enhance its properties for different applications. Bronze, a copper-tin alloy, is also described as being durable, weather-resistant, and commonly used in outdoor statues and architecture.
The document discusses the development and structure of the modern periodic table. It describes how scientists like Newlands, Mendeleev, and Moseley contributed to organizing the elements based on their atomic structure. The modern periodic table arranges elements in periods and groups based on proton number and electron configuration. It explains the properties and classification of different blocks of elements like metals, non-metals, metalloids, alkali metals, alkaline earth metals, halogens and noble gases.
Membranes control the composition of cells through active and passive transport. Materials move across membranes via simple diffusion, facilitated diffusion, osmosis, and active transport. The sodium-potassium pump uses active transport to move ions against their gradients in axons. Vesicles transport materials within cells from the ER to the Golgi and plasma membrane by budding off and fusing. Endocytosis transports materials into cells while exocytosis releases them out of cells.
Phospholipid bilayers are selectively permeable membranes that control the movement of molecules into and out of cells through passive and active transport mechanisms. Passive transport includes diffusion, facilitated diffusion, and osmosis, which allow molecules to move down their concentration gradients without energy expenditure. Active transport requires energy in the form of ATP to move molecules against their concentration gradients, such as sodium-potassium pumps that repolarize neurons after firing. Membrane transport is essential for cellular functions like nutrient absorption, waste removal, and nerve signal transmission.
Membranes control the composition of cells through active and passive transport. Passive transport includes simple diffusion, facilitated diffusion, and osmosis which allow particles to move across membranes down their concentration gradients. Active transport requires ATP and transports particles against their gradients using protein pumps. Materials are also moved within cells via vesicles budding off membranes and traveling within the cell. Materials enter and exit cells through endocytosis and exocytosis. Osmotic control is important for medical procedures where tissues must be bathed in isotonic solutions to prevent osmosis from damaging cells. Estimating osmolality through osmosis experiments provides opportunities to improve scientific skills.
Guided notes covering material from Topic 1.4 of the updated IB Biology syllabus for 2016 exams. Notes sequence and prompts are based on the Oxford IB Biology textbook by Allott and Mindorff.
Membranes control the composition of cells through active and passive transport. Passive transport involves diffusion of substances down a concentration gradient and does not require energy. There are three main types of passive transport: simple diffusion of small molecules, osmosis of water molecules, and facilitated diffusion of larger molecules via membrane proteins. Active transport moves substances against a concentration gradient and requires energy. Membranes play a key role in cellular function by regulating what passes in and out of cells.
Membranes control the movement of substances into and out of cells through passive and active transport mechanisms. Materials enter cells through endocytosis and leave through exocytosis. Vesicles help move substances within cells by budding off membranes and fusing with other membranes. Membranes selectively control diffusion of substances in and out of cells down concentration gradients through passive transport like simple diffusion, facilitated diffusion, and osmosis. Active transport requires energy and pumps substances against concentration gradients using proteins like sodium-potassium pumps in neurons. Membrane transport mechanisms precisely regulate the internal composition of cells.
ion channel and carrier protein By KK Sahu SirKAUSHAL SAHU
INTRODUCTION - DEFINITION OF ION CANALS- HISTORY AND DIVERSITY OF ION CANALS- CARRIER PROTEIN-DEFINITION - CLASSES OF CARRIER PROTEIN - MECHANISM OF ION CANALS AND CARRIER PROTEIN - MEMBRANE TRANSPORT- BIOLOGICAL ROLE OF ION CANALS AND CARRIER PROTEIN - CONCLUSION - REFERENCE
Mechanism of transport of small molecules across membrane.pptxBharathReddy443625
This document discusses mechanisms of transporting small molecules across cell membranes. It begins by explaining that while some molecules like oxygen and carbon dioxide can diffuse through lipid bilayers, charged and polar molecules require transport mechanisms. It then describes three main types of transport - passive transport down concentration gradients or electrochemical gradients, active transport using transporter proteins and ion pumps, and transport through ion channels. Specific examples are given of aquaporin water channels, glucose and sodium symporters, calcium and sodium pumps, and different gated ion channels. The role of the sodium-potassium pump and potassium leak channels in generating the resting membrane potential is also explained.
The document discusses the structure and functions of the cell membrane. It begins by defining the cell and cell membrane. The cell membrane, also called the plasma membrane, is a biological membrane separating the interior of a cell from the outside environment. It has a double layered structure of phospholipids and embedded proteins. The cell membrane serves protective, selective permeability, absorptive, excretory, gas exchange, and shape maintenance functions. It discusses various transport mechanisms like passive transport, active transport, ion channels, and vesicular transport that allow movement of substances across the membrane.
cell membrane transport mechanisms and related disorders ppt..pptxNitinchaudharY351367
The document discusses cell membranes and transport mechanisms. It begins by describing the structure and function of the cell membrane, including that it is a lipid bilayer containing proteins. It then explains the different types of transport across membranes, including passive transport mechanisms like simple diffusion and facilitated diffusion, as well as active transport mechanisms like primary active transport using ATP and secondary active transport using ion gradients. Specific transport proteins and mechanisms discussed include sodium-potassium pumps, calcium pumps, hydrogen-potassium pumps, and sodium-glucose co-transporters. The document concludes by mentioning some applied aspects regarding transport mechanisms.
Transmembrane transport of ions and small molecules by Kainat RamzanKainatRamzan3
The plasma membrane is a selectively permeable barrier between the cell and the extracellular environment. Its permeability properties ensure that essential molecules such as ions, glucose, amino acids, and lipids readily enter the cell, and waste compounds leave the cell.
This document summarizes different types of transport across cell membranes, including passive transport mechanisms like diffusion and osmosis, as well as active transport processes that require energy. Passive transport includes diffusion of substances down their concentration gradient and osmosis, where water diffuses through selectively permeable membranes. Active transport moves substances against their concentration gradient using cellular energy in the form of ATP. It discusses specific examples of active transport like the sodium-potassium pump and endocytosis/exocytosis for larger molecules.
The document discusses cell membranes and their structure and functions. It describes membranes as a fluid mosaic model consisting of a phospholipid bilayer with integral and peripheral membrane proteins. The hydrophobic and hydrophilic properties of phospholipids help maintain membrane structure. Membrane proteins function in hormone binding, enzyme activity, transport, and cell communication. The document defines passive transport mechanisms of diffusion and osmosis, and explains active transport requiring ATP. Vesicles transport materials within cells, and membrane fluidity allows shape change during endocytosis and exocytosis.
This document discusses various mechanisms of transport across cell membranes, including: passive transport mechanisms like diffusion, facilitated diffusion, and osmosis which do not require energy; and active transport mechanisms like protein pumps, endocytosis, and exocytosis which require energy. It provides details on the structure of the cell membrane and defines each transport process. Examples are given of molecules that diffuse through membranes as well as the sodium-potassium pump as an example of active transport.
The document discusses various mechanisms of transport across cell membranes, including diffusion, facilitated diffusion, osmosis, active transport, and bulk transport. Diffusion is the passive movement of molecules from an area of high concentration to low concentration down a gradient. Facilitated diffusion utilizes protein channels to transport molecules that cannot diffuse directly through the membrane. Osmosis is the diffusion of water across a partially permeable membrane from an area of high water concentration to low. Active transport requires energy and transports molecules against a gradient using carrier proteins. Bulk transport moves many molecules at once through endocytosis, exocytosis, or vesicle transport.
The document summarizes key concepts about solute transport across membranes in plant and animal cells. It discusses passive diffusion of small molecules, facilitated diffusion mediated by carrier and channel proteins, and active transport driven by ATP hydrolysis including sodium-potassium pumps and co-transport. It also describes bulk transport mechanisms like phagocytosis, pinocytosis, and receptor-mediated endocytosis as well as exocytosis for exporting materials. The seminar was presented to discuss these transport mechanisms in detail.
Cells take in nutrients and expel waste through their membranes using two main processes: passive transport and active transport. Passive transport moves substances across membranes without cell energy expenditure, including diffusion, osmosis, and facilitated diffusion using carrier proteins or ion channels. Active transport requires cell energy in the form of ATP to pump substances against their concentration gradient, as seen with the sodium-potassium pump. Endocytosis and exocytosis use vesicles to transport larger molecules into and out of cells. Membrane receptor proteins also allow cells to communicate.
There are two main types of transport across cell membranes - passive transport which does not require energy, and active transport which does require energy in the form of ATP. Passive transport includes simple diffusion, facilitated diffusion, and osmosis, and involves movement of substances along concentration gradients. Active transport transports substances against concentration gradients using membrane proteins and requires energy. Materials also move into and out of cells through endocytosis and exocytosis using membrane-bound vesicles.
This document summarizes the three main types of transport across cell membranes: passive transport, active transport, and bulk transport. Passive transport includes diffusion, osmosis, and facilitated diffusion, which move molecules through membranes down concentration gradients without energy expenditure. Active transport moves molecules against concentration gradients using carrier proteins and energy from ATP hydrolysis. Bulk transport uses endocytosis and exocytosis to move large particles and vesicles across membranes.
The document discusses the origin of the first cells on Earth. It states that cells can only be formed through the division of pre-existing cells, so the first cells must have arisen from non-living material through a process known as abiogenesis. Abiogenesis likely occurred in four stages: 1) the non-living synthesis of simple organic molecules, 2) the assembly of these molecules into complex polymers, 3) the development of polymers that could self-replicate, and 4) the encapsulation of these molecules within membranes. Early Earth had a reducing atmosphere containing gases like hydrogen, nitrogen, and methane that could have contributed to the non-living synthesis of organic compounds from which the first cells developed.
The structure of biological membranes allows them to be fluid and dynamic. Membranes are made of a phospholipid bilayer with proteins and cholesterol embedded within. Phospholipids form bilayers due to their amphipathic properties - their hydrophobic tails orient inward while hydrophilic heads remain on the outer surfaces. Membrane proteins perform diverse functions and can be integral or peripheral. Cholesterol increases membrane stability while reducing fluidity. Early models of membrane structure proposed protein layers sandwiching the bilayer, but evidence demonstrated proteins are mobile within the bilayer, leading to the current fluid mosaic model.
Membranes control the composition of cells through active and passive transport. Materials move across membranes via simple diffusion, facilitated diffusion, osmosis, and active transport. The sodium-potassium pump uses active transport to move ions against their gradients in axons. Vesicles transport materials within cells from the ER to the Golgi and plasma membrane by budding off and fusing. Endocytosis transports materials into cells while exocytosis releases them out of cells.
Phospholipid bilayers are selectively permeable membranes that control the movement of molecules into and out of cells through passive and active transport mechanisms. Passive transport includes diffusion, facilitated diffusion, and osmosis, which allow molecules to move down their concentration gradients without energy expenditure. Active transport requires energy in the form of ATP to move molecules against their concentration gradients, such as sodium-potassium pumps that repolarize neurons after firing. Membrane transport is essential for cellular functions like nutrient absorption, waste removal, and nerve signal transmission.
Membranes control the composition of cells through active and passive transport. Passive transport includes simple diffusion, facilitated diffusion, and osmosis which allow particles to move across membranes down their concentration gradients. Active transport requires ATP and transports particles against their gradients using protein pumps. Materials are also moved within cells via vesicles budding off membranes and traveling within the cell. Materials enter and exit cells through endocytosis and exocytosis. Osmotic control is important for medical procedures where tissues must be bathed in isotonic solutions to prevent osmosis from damaging cells. Estimating osmolality through osmosis experiments provides opportunities to improve scientific skills.
Guided notes covering material from Topic 1.4 of the updated IB Biology syllabus for 2016 exams. Notes sequence and prompts are based on the Oxford IB Biology textbook by Allott and Mindorff.
Membranes control the composition of cells through active and passive transport. Passive transport involves diffusion of substances down a concentration gradient and does not require energy. There are three main types of passive transport: simple diffusion of small molecules, osmosis of water molecules, and facilitated diffusion of larger molecules via membrane proteins. Active transport moves substances against a concentration gradient and requires energy. Membranes play a key role in cellular function by regulating what passes in and out of cells.
Membranes control the movement of substances into and out of cells through passive and active transport mechanisms. Materials enter cells through endocytosis and leave through exocytosis. Vesicles help move substances within cells by budding off membranes and fusing with other membranes. Membranes selectively control diffusion of substances in and out of cells down concentration gradients through passive transport like simple diffusion, facilitated diffusion, and osmosis. Active transport requires energy and pumps substances against concentration gradients using proteins like sodium-potassium pumps in neurons. Membrane transport mechanisms precisely regulate the internal composition of cells.
ion channel and carrier protein By KK Sahu SirKAUSHAL SAHU
INTRODUCTION - DEFINITION OF ION CANALS- HISTORY AND DIVERSITY OF ION CANALS- CARRIER PROTEIN-DEFINITION - CLASSES OF CARRIER PROTEIN - MECHANISM OF ION CANALS AND CARRIER PROTEIN - MEMBRANE TRANSPORT- BIOLOGICAL ROLE OF ION CANALS AND CARRIER PROTEIN - CONCLUSION - REFERENCE
Mechanism of transport of small molecules across membrane.pptxBharathReddy443625
This document discusses mechanisms of transporting small molecules across cell membranes. It begins by explaining that while some molecules like oxygen and carbon dioxide can diffuse through lipid bilayers, charged and polar molecules require transport mechanisms. It then describes three main types of transport - passive transport down concentration gradients or electrochemical gradients, active transport using transporter proteins and ion pumps, and transport through ion channels. Specific examples are given of aquaporin water channels, glucose and sodium symporters, calcium and sodium pumps, and different gated ion channels. The role of the sodium-potassium pump and potassium leak channels in generating the resting membrane potential is also explained.
The document discusses the structure and functions of the cell membrane. It begins by defining the cell and cell membrane. The cell membrane, also called the plasma membrane, is a biological membrane separating the interior of a cell from the outside environment. It has a double layered structure of phospholipids and embedded proteins. The cell membrane serves protective, selective permeability, absorptive, excretory, gas exchange, and shape maintenance functions. It discusses various transport mechanisms like passive transport, active transport, ion channels, and vesicular transport that allow movement of substances across the membrane.
cell membrane transport mechanisms and related disorders ppt..pptxNitinchaudharY351367
The document discusses cell membranes and transport mechanisms. It begins by describing the structure and function of the cell membrane, including that it is a lipid bilayer containing proteins. It then explains the different types of transport across membranes, including passive transport mechanisms like simple diffusion and facilitated diffusion, as well as active transport mechanisms like primary active transport using ATP and secondary active transport using ion gradients. Specific transport proteins and mechanisms discussed include sodium-potassium pumps, calcium pumps, hydrogen-potassium pumps, and sodium-glucose co-transporters. The document concludes by mentioning some applied aspects regarding transport mechanisms.
Transmembrane transport of ions and small molecules by Kainat RamzanKainatRamzan3
The plasma membrane is a selectively permeable barrier between the cell and the extracellular environment. Its permeability properties ensure that essential molecules such as ions, glucose, amino acids, and lipids readily enter the cell, and waste compounds leave the cell.
This document summarizes different types of transport across cell membranes, including passive transport mechanisms like diffusion and osmosis, as well as active transport processes that require energy. Passive transport includes diffusion of substances down their concentration gradient and osmosis, where water diffuses through selectively permeable membranes. Active transport moves substances against their concentration gradient using cellular energy in the form of ATP. It discusses specific examples of active transport like the sodium-potassium pump and endocytosis/exocytosis for larger molecules.
The document discusses cell membranes and their structure and functions. It describes membranes as a fluid mosaic model consisting of a phospholipid bilayer with integral and peripheral membrane proteins. The hydrophobic and hydrophilic properties of phospholipids help maintain membrane structure. Membrane proteins function in hormone binding, enzyme activity, transport, and cell communication. The document defines passive transport mechanisms of diffusion and osmosis, and explains active transport requiring ATP. Vesicles transport materials within cells, and membrane fluidity allows shape change during endocytosis and exocytosis.
This document discusses various mechanisms of transport across cell membranes, including: passive transport mechanisms like diffusion, facilitated diffusion, and osmosis which do not require energy; and active transport mechanisms like protein pumps, endocytosis, and exocytosis which require energy. It provides details on the structure of the cell membrane and defines each transport process. Examples are given of molecules that diffuse through membranes as well as the sodium-potassium pump as an example of active transport.
The document discusses various mechanisms of transport across cell membranes, including diffusion, facilitated diffusion, osmosis, active transport, and bulk transport. Diffusion is the passive movement of molecules from an area of high concentration to low concentration down a gradient. Facilitated diffusion utilizes protein channels to transport molecules that cannot diffuse directly through the membrane. Osmosis is the diffusion of water across a partially permeable membrane from an area of high water concentration to low. Active transport requires energy and transports molecules against a gradient using carrier proteins. Bulk transport moves many molecules at once through endocytosis, exocytosis, or vesicle transport.
The document summarizes key concepts about solute transport across membranes in plant and animal cells. It discusses passive diffusion of small molecules, facilitated diffusion mediated by carrier and channel proteins, and active transport driven by ATP hydrolysis including sodium-potassium pumps and co-transport. It also describes bulk transport mechanisms like phagocytosis, pinocytosis, and receptor-mediated endocytosis as well as exocytosis for exporting materials. The seminar was presented to discuss these transport mechanisms in detail.
Cells take in nutrients and expel waste through their membranes using two main processes: passive transport and active transport. Passive transport moves substances across membranes without cell energy expenditure, including diffusion, osmosis, and facilitated diffusion using carrier proteins or ion channels. Active transport requires cell energy in the form of ATP to pump substances against their concentration gradient, as seen with the sodium-potassium pump. Endocytosis and exocytosis use vesicles to transport larger molecules into and out of cells. Membrane receptor proteins also allow cells to communicate.
There are two main types of transport across cell membranes - passive transport which does not require energy, and active transport which does require energy in the form of ATP. Passive transport includes simple diffusion, facilitated diffusion, and osmosis, and involves movement of substances along concentration gradients. Active transport transports substances against concentration gradients using membrane proteins and requires energy. Materials also move into and out of cells through endocytosis and exocytosis using membrane-bound vesicles.
This document summarizes the three main types of transport across cell membranes: passive transport, active transport, and bulk transport. Passive transport includes diffusion, osmosis, and facilitated diffusion, which move molecules through membranes down concentration gradients without energy expenditure. Active transport moves molecules against concentration gradients using carrier proteins and energy from ATP hydrolysis. Bulk transport uses endocytosis and exocytosis to move large particles and vesicles across membranes.
The document discusses the origin of the first cells on Earth. It states that cells can only be formed through the division of pre-existing cells, so the first cells must have arisen from non-living material through a process known as abiogenesis. Abiogenesis likely occurred in four stages: 1) the non-living synthesis of simple organic molecules, 2) the assembly of these molecules into complex polymers, 3) the development of polymers that could self-replicate, and 4) the encapsulation of these molecules within membranes. Early Earth had a reducing atmosphere containing gases like hydrogen, nitrogen, and methane that could have contributed to the non-living synthesis of organic compounds from which the first cells developed.
The structure of biological membranes allows them to be fluid and dynamic. Membranes are made of a phospholipid bilayer with proteins and cholesterol embedded within. Phospholipids form bilayers due to their amphipathic properties - their hydrophobic tails orient inward while hydrophilic heads remain on the outer surfaces. Membrane proteins perform diverse functions and can be integral or peripheral. Cholesterol increases membrane stability while reducing fluidity. Early models of membrane structure proposed protein layers sandwiching the bilayer, but evidence demonstrated proteins are mobile within the bilayer, leading to the current fluid mosaic model.
The structure of biological membranes allows them to be fluid and dynamic. Phospholipid molecules spontaneously arrange into a bilayer structure in water due to their amphipathic properties. This structure orients the hydrophobic tails of the phospholipids inward, shielded from water, while the hydrophilic heads remain in contact with water. Additional components such as membrane proteins and cholesterol are embedded within the phospholipid bilayer and influence membrane properties such as fluidity. Cholesterol increases the packing of phospholipids and regulates membrane fluidity and permeability.
Eukaryotic cells have a more complex structure than prokaryotic cells due to compartmentalization by membrane-bound organelles. An electron micrograph of pancreatic exocrine cells clearly shows organelles such as the nucleus, mitochondria, rough endoplasmic reticulum, Golgi apparatus, and vesicles. These organelles have specialized functions, for example the nucleus contains genetic material, mitochondria produce ATP through respiration, and the endoplasmic reticulum and Golgi apparatus are involved in protein transport and modification.
1. The cell theory states that all living things are composed of cells, cells are the basic unit of structure and function in living things, and new cells are produced from existing cells.
2. Unicellular organisms carry out all the functions of life within a single cell, including metabolism, reproduction, response to stimuli, homeostasis, excretion, nutrition, and growth. These functions can be observed in organisms like Paramecium and Chlorella through processes like contracting vacuoles and photosynthesis.
3. As cells increase in size, their surface area to volume ratio decreases, limiting their ability to exchange materials and wastes. This limitation on cell size is an important factor in the cell theory.
The document discusses objectives and concepts related to statistical analysis in biology, including:
- Types of data, graphs, and statistical analyses such as mean, standard deviation, and chi square analysis.
- Calculating and interpreting the mean and standard deviation of a data set to describe variability.
- Using standard deviation to compare the spread of data between samples and determine significance.
- Performing hypothesis testing using calculated t values, t tables, and p values to determine if differences between data sets are statistically significant.
This document outlines objectives and concepts for a unit on statistical analysis in IB Diploma Biology. It discusses types of data, graphs, and statistics including mean, standard deviation, correlation, and significance testing. Key concepts covered are descriptive statistics like mean and standard deviation to summarize data, the importance of variability, and inferential statistics like hypothesis testing and p-values to draw conclusions about populations from samples. The goals are to calculate basic statistics, choose appropriate graphs, understand significance, and apply proper lab techniques and formats.
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.)
Temple of Asclepius in Thrace. Excavation resultsKrassimira Luka
The temple and the sanctuary around were dedicated to Asklepios Zmidrenus. This name has been known since 1875 when an inscription dedicated to him was discovered in Rome. The inscription is dated in 227 AD and was left by soldiers originating from the city of Philippopolis (modern Plovdiv).
How to Make a Field Mandatory in Odoo 17Celine George
In Odoo, making a field required can be done through both Python code and XML views. When you set the required attribute to True in Python code, it makes the field required across all views where it's used. Conversely, when you set the required attribute in XML views, it makes the field required only in the context of that particular view.
How to Setup Warehouse & Location in Odoo 17 InventoryCeline George
In this slide, we'll explore how to set up warehouses and locations in Odoo 17 Inventory. This will help us manage our stock effectively, track inventory levels, and streamline warehouse operations.
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
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
Strategies for Effective Upskilling is a presentation by Chinwendu Peace in a Your Skill Boost Masterclass organisation by the Excellence Foundation for South Sudan on 08th and 09th June 2024 from 1 PM to 3 PM on each day.
1. By Chris Paine
https://bioknowledgy.weebly.com/
1.4 Membrane transport
Essential idea: Membranes control the composition
of cells by active and passive transport.
The background image is a piece of artwork inspired by the complexity of an E. Coli.
Complexity in cell structure is much greater still in Eukaryotes and this only possible
through the compartmentalisation and the selective transport membranes allow.
By Chris Paine
https://bioknowledgy.weebly.com/
http://onlinelibrary.wiley.com/doi/10.1002/bmb.20345/full#fig2
2. Understandings, Applications and Skills
Statement Guidance
1.4.U1 Particles move across membranes by simple
diffusion, facilitated diffusion, osmosis and active
transport.
1.4.U2 The fluidity of membranes allows materials to be
taken into cells by endocytosis or released by
exocytosis.
1.4.U3 Vesicles move materials within cells.
1.4.A1 Structure and function of sodium–potassium pumps
for active transport and potassium channels for
facilitated diffusion in axons.
1.4.A2 Tissues or organs to be used in medical
procedures must be bathed in a solution with the
same osmolarity as the cytoplasm to prevent
osmosis.
1.4.S1 Estimation of osmolarity in tissues by bathing
samples in hypotonic and hypertonic solutions.
(Practical 2)
Osmosis experiments are a useful opportunity
to stress the need for accurate mass and
volume measurements in scientific
experiments.
3. 1.4.U1 Particles move across membranes by simple diffusion, facilitated diffusion,
osmosis and active transport.
4. 1.4.U1 Particles move across membranes by simple diffusion, facilitated diffusion,
osmosis and active transport.
http://highered.mheducation.com/sites/0072495855/student_view0/chapter2/anima
tion__how_diffusion_works.html
http://www.phschool.com/science/biology_place/labb
ench/lab1/concepts.html
5. 1.4.U1 Particles move across membranes by simple diffusion, facilitated diffusion,
osmosis and active transport.
6. 1.4.U1 Particles move across membranes by simple diffusion, facilitated diffusion,
osmosis and active transport.
7. 1.4.U1 Particles move across membranes by simple diffusion, facilitated diffusion,
osmosis and active transport.
http://www.northland.cc.mn.us/biology/Biology1111/animations/transpor
t1.html
8. 1.4.U1 Particles move across membranes by simple diffusion, facilitated diffusion,
osmosis and active transport.
10. Osmosis may occur when there is a partially
permeable membrane, such as a cell
membrane.
When a cell is submerged in water, the water
molecules pass through the cell membrane
from an area of low solute concentration
(outside the cell) to one of high solute
concentration (inside the cell) (Wikipedia)
Aquaporin is an integral protein that, as
it’s name suggests, acts as a pore in the
membrane that speeds the movement
of water molecules
http://opm.phar.umich.edu/protein.php?pdbid=1sor
1.4.U1 Particles move across membranes by simple diffusion, facilitated diffusion,
osmosis and active transport.
http://highered.mcgraw-
hill.com/sites/0072495855/student_vie
w0/chapter2/animation__how_osmosis
_works.html
12. The importance of osmotic control
preventing damage to cells and tissues
1.4.A2 Tissues or organs to be used in medical procedures must be bathed in a solution
with the same osmolarity as the cytoplasm to prevent osmosis.
Common medical procedures in
which an isotonic saline
solution is useful:
• fluids introduction to a
patient’s blood system via an
intravenous drip, e.g for
rehydration
• used to rinse wounds, skin
abrasions etc.
• keep areas of damaged skin
moist before applying skin
grafts
• eye drops/wash
• frozen and used pack donor
organs for transportation
http://www.defenseimagery.mil/imageRetrieve.action?guid=8c9d5fade029a4f5a68fe667d1ae802ba9f30dd5&t=2
14. http://commons.wikimedia.org/wiki/File:Scheme_facilitated_diffusion_in_cell_membrane-en.svg
Facilitated Diffusion:
Large and polar molecules can’t get across the membrane via
simple diffusion
Transmembrane (polytopic) proteins recognise a particular
molecule and help it to move across the membrane. The
direction it moves is dependent on the concentration gradient.
Watch the animation
1.4.U1 Particles move across membranes by simple diffusion, facilitated diffusion,
osmosis and active transport.
http://highered.mcgraw-
hill.com/sites/0072495855/student_view0/chapter2/ani
mation__how_facilitated_diffusion_works.html
15. 1.4.A1 Structure and function of sodium–potassium pumps for active transport and
potassium channels for facilitated diffusion in axons.
http://bioserv.fiu.edu/~walterm/human_online/nervous/nervous_system_files/image012.gif
1. At one stage during a nerve
impulse there are relatively
more positive charges inside.
2. This voltage change causes
potassium channels to open,
allowing potassium ions to
diffuse out of the axon.
3. Once the voltage conditions
change the channel rapidly
closes again.
Potassium channels in axons are voltage gated. They enable the facilitated
diffusion of potassium out of the axon
n.b. other positively charged ions that we might expect to pass through the pore are either too
large to fit through or are too small to form bonds with the amino acids in the narrowest part
of the pore - this explains the specificity of the channel.
16. Primary active transport requires ATP.
Integral protein pumps use the energy from the
hydrolysis of ATP to move ions or large
molecules across the cell membrane.
Molecules are moved against their
concentration gradient
http://commons.wikimedia.org/wiki/File:Scheme_sodium-potassium_pump-en.svg
1.4.U1 Particles move across membranes by simple diffusion, facilitated diffusion,
osmosis and active transport.
http://highered.mcgraw-
hill.com/sites/0072495855/student_view0/chapter2/animation__how_the_sodium_pot
assium_pump_works.html
17. 1.4.U1 Particles move across membranes by simple diffusion, facilitated diffusion,
osmosis and active transport.
18. 1.4.U1 Particles move across membranes by simple diffusion, facilitated diffusion,
osmosis and active transport.
19. 1.4.A1 Structure and function of sodium–potassium pumps for active transport and
potassium channels for facilitated diffusion in axons.
http://commons.wikimedia.org/wiki/File:Scheme_sodium-potassium_pump-en.svg
The sodium–potassium pump follows a repeating cycle of steps that result in
three sodium ions being pumped out of the axon (of neurons) and two
potassium ions being pumped in. Each time the pump goes round this cycle it
uses one ATP. The cycle consists of these steps:
The interior of the pump is open to the inside of
the axon; three sodium ions enter the pump
and attach to their binding sites.
1
20. 1.4.A1 Structure and function of sodium–potassium pumps for active transport and
potassium channels for facilitated diffusion in axons.
http://commons.wikimedia.org/wiki/File:Scheme_sodium-potassium_pump-en.svg
The interior of the pump opens to the outside
of the axon and the three sodium ions are
released.
2 ATP transfers a phosphate group from itself to
the pump; this causes the pump to change
shape and the interior is then closed.
3
21. 1.4.A1 Structure and function of sodium–potassium pumps for active transport and
potassium channels for facilitated diffusion in axons.
http://commons.wikimedia.org/wiki/File:Scheme_sodium-potassium_pump-en.svg
Two potassium ions from outside can then
enter and attach to their binding sites.
5 Binding of potassium causes release of
the phosphate group; this causes the
pump to change shape again so that it is
again only open to the inside of the axon.
4
The interior of the pump opens to the inside
of the axon and the two potassium ions are
released. Sodium ions can now enter and
bind to the pump again (#1).
6
23. Typically, the
concentration
gradient of the
second solute was
created by primary
active transport,
and the diffusion of
the second solute
across the
membrane drives
secondary active
transport.
1.4.U1 Particles move across membranes by simple diffusion, facilitated diffusion,
osmosis and active transport.
http://bcs.whfreeman.com/thelifewire/content/chp05/0502002.html
24. Vesicles are small spheroidal
packages that bud off of the
RER and the Golgi apparatus
They carry proteins produced
by ribosomes on the RER to
the Golgi apparatus, where
they are prepared for export
from the cell via another
vesicle
http://www.sumanasinc.com/webcontent/animations
/content/vesiclebudding.html
1.4.U3 Vesicles move materials within cells.
Use the animated tutorial to
learn more about the formation
and use of vesicles in cells
25. Endocytosis: The taking in
of external substances by an
inward pouching of the
plasma membrane, forming
a vesicle
Exocytosis: The release of
substances from a cell
(secretion) when a vesicle
joins with the cell plasma
membrane.
Diagrams on following slides
http://highered.mcgraw-hill.com/olc/dl/120068/bio02.swf
1.4.U2 The fluidity of membranes allows materials to be taken into cells by endocytosis
or released by exocytosis.
28. 1.4.U2 The fluidity of membranes allows materials to be taken into cells by endocytosis
or released by exocytosis.
29. 1.4.S1 Estimation of osmolarity in tissues by bathing samples in hypotonic and
hypertonic solutions. (Practical 2)
http://www.saps.org.uk/secondary/teaching-resources/286-measuring-the-
water-potential-of-a-potato-cell
http://www.nuffieldfoundation.org/practical-biology/investigating-effect-
concentration-blackcurrant-squash-osmosis-chipped-potatoes
The two lab protocols shown suggest
different ways of measuring the dependent
variable.
This is an ideal opportunity to practise and
improve your understanding of the
following IA criteria:
• Analysis
• Evaluation
• Communication
n.b. estimation of osmolarity should be limited to statements such as “this tissue has an osmolarity
equivalent to a 2% sucrose solution”. Molar concentrations maybe used in place of % and other solution
such as sodium chloride maybe used in place of glucose.
Estimation of osmolarity is
a simple lab with many
possible variations.