Cell Membranes

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  • Created by: jenny
  • Created on: 22-05-16 14:30

1. What is diffusion?

  • Net movement of molecules from an area of high concentration to an area of low concentration
  • Movement of ion across membranes through protein pumps that use ATP to move within the mebrane
  • Channel proteins provide pathways for charged molecules or those that are too big,
  • Net movement of water from high water potential to low water potential
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2. What is osmosis?

  • Movement of ion across membranes through protein pumps that use ATP to move within the mebrane
  • Channel proteins provide pathways for charged molecules or those that are too big,
  • Net movement of water from high water potential to low water potential
  • Vesicles moving large amount of substance in and out of the cell via ATP

3. What happens to a plann cell in high and low Ψ ?

  • Turgid and Plasmolysed
  • Lysis and Crentation

4. What are glycoprotiens used for?

  • have a carbohydrate attached and is used for cell signaling, adhesion and cell surface antigens
  • Maintains the stability and fluidity of the bi-layer when the temperature fluctuates
  • Channel proteins allow larger molecules and ions through, carrier proteins actively transport things in and out of the cell

5. How is exocytosis and endocytosis carried out?

  • Vesicles moving large amount of substance in and out of the cell via ATP
  • Channel proteins provide pathways for charged molecules or those that are too big,

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