Cellular transport involves the passive and active movement of substances across the cell membrane. Passive transport includes diffusion, facilitated diffusion, and osmosis, which move substances down their concentration gradient without energy expenditure. Active transport moves substances against their gradient by using cellular energy in the form of ATP. Endocytosis and exocytosis are mechanisms for cells to take in and release larger particles by engulfing and vesiculating parts of the membrane. Cell size and surface area have an important relationship to transport, as larger surface area is needed to support substance movement into and out of a cell.
Transport of biomolecules across cell membraneMohan Raj
The diffusion of water through the plasma membrane is of such importance to the cell that it is given a special name: osmosis. This page will examine how ions and small molecules are transported across cell membranes. The transport of macromolecules through membranes is described in Endocytosis.
Transport of biomolecules across cell membraneMohan Raj
The diffusion of water through the plasma membrane is of such importance to the cell that it is given a special name: osmosis. This page will examine how ions and small molecules are transported across cell membranes. The transport of macromolecules through membranes is described in Endocytosis.
cell biology topic transport across cell membrane. transport of important structures accross plasma mebrane of different types of cell in humans. structure and function of cell membane
A cell is in similitude with a fenced house that has a gate. The cell membrane serves to a cell what function does to a house. Just like a gate allows for passage to and fro the house, the cell membrane has adaptions that allow communication between the internal environment with the external environment.
cell biology topic transport across cell membrane. transport of important structures accross plasma mebrane of different types of cell in humans. structure and function of cell membane
A cell is in similitude with a fenced house that has a gate. The cell membrane serves to a cell what function does to a house. Just like a gate allows for passage to and fro the house, the cell membrane has adaptions that allow communication between the internal environment with the external environment.
The structure of the cell membrane, the phospholipid layer distinguished to the break down of protein and the lipid layer. Their structural components and the molecular basis of it.
9 - Metabolism and Transfering Energy - Part TwoAhmad V.Kashani
سلولهای زنده برای انجام بسیاری از وظایف خود به انتقال انرژی از منابع خارجی نیاز دارند. همه ارگانیسمها باید از طریق فتوسنتز و تنفس سلولی این انرژی را از مولکول های آلی موجود درغذا بدست آورند. تنفس با استفاده از اکسیژن و تولید ATP، باعث شکستن این سوخت میشود. مواد زائد این نوع تنفس، دی اکسید کربن و آب، مواد اولیه فتوسنتز هستند. در این اسلاید، من سعی می کنم چگونگی برداشت سلولها از انرژی ذخیره شده در مولکولهای آلی و استفاده از آن برای تولید ATP از طریق تنفس سلولی را توضیح دهم.
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Living cells require transfusions of energy from outside sources to perform their many tasks. All organism need to obtain this energy from organic molecules of food through photosynthesis and cellular respiration. Respiration breaks this fuel down, using oxygen and generating ATP. The waste products of this type of respiration, carbon dioxide and water, are the raw materials for photosynthesis. In this slide, I try to explain how cells harvest this energy stored in organic molecules and used it to generate ATP through cellular respiration.
Chapter 15
The basic unit of life
Characteristics of Life
Macromolecules Needed for Life
Cell Types: Prokaryotic and Eukaryotic
The Microscope
Tour of a Eukaryotic Cell
The Cell Membrane
Transport into and out of Cells
Cell Communication
How Cells Reproduce
How Cells Use Energy
ATP and Chemical Reactions in Cells
Photosynthesis
Cellular Respiration and Fermentation
This is a simple worksheet for drawing and outlining the stages of mitosis. There are 4 boxes for Prophase, Metaphase, Anaphase, and Telophase with 1 extra box for either interphase or cytokinesis.
Grade 9 Biology. Introduction to the cell cycle. These are the guided notes for the Cell Cycle PPT. The goal is to introduction the stages of the cell cycle. G1, S, and G2. There is a lot of space for diagrams. Students are asked to consider surface-area to volume ratio and size limitations for the cell. Additionally, they should be able to identify the differences between each stage of the cell cycle and interphase.
3. Outline
• Passive Transport
– Channel Proteins
– Carrier Proteins
• Diffusion
• Osmosis
• Active Transport
• Endocytosis and Exocytosis
• Cell Size and Transport
4. Transport
• Materials need to move in and out of a cell
• Pass through cell membrane
• Substance concentration is important
12. Check it Out
• http://biomanbio.com/GamesandLabs/Cell
games/celldefense.html
13. Active Transport
• Against concentration gradient
– Low concentration to high concentration
• Uses energy (ATP)
14. Endocytosis
• Takes in substances wrapped in a
membrane
• Forms a vesicle
• Large objects (bacteria and viruses)
15. Exocytosis
• Objects in a cell’s vesicle are released
outside the cell
– Membrane-bound inside the cell
• Molecules made in cell (proteins)
16.
17. Cell Size and Surface Area
• Read p65
• Movement of substances in and out of the
cell is important for survival
• Cell membrane size needs to be large
compared to the volume
– Cell membrane size = surface area
– Cell’s volume = space inside the cell
22. Outline
• Cellular respiration
– Reactions in the cytoplasm
– Reactions in the mitochondria
• Fermentation
– Lactic-Acid Fermentation
– Alcohol Fermentation
• Photosynthesis
– Lights and Pigments
– Reactions is Chloroplasts
– Importance
23. Cellular Respiration
• Series of chemical reactions
• Converts food molecules into energy
(ATP)
• In cytoplasm and mitochondria
24.
25. Glycolysis
• In cytoplasm
• Glucose, a simple sugar, is taken into the
cell
• Glucose and energy undergo a chemical
reaction
• First step in cellular respiration
• Glucose + ATP smaller molecules +
ATP
27. Step 2: Cellular Respiration
• After glycolysis
• In mitochondria
• Small molecules and oxygen are taken
into mitochondria
• ATP, water and carbon dioxide are
released
33. Photosynthesis
• Series of chemical reactions
• Plants and some unicellular organisms
• Uses light energy, water, and CO2
• Makes glucose and oxygen
34. Lights and Pigments
• In plants, pigments such as chlorophyll
absorb all colors of light except green
• Over plants reflect other colors