Cell Membranes

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

1. What is facilitated diffusion?

  • Channel proteins provide pathways for charged molecules or those that are too big,
  • Vesicles moving large amount of substance in and out of the cell via ATP
  • Net movement of water from high water potential to low water potential
  • Movement of ion across membranes through protein pumps that use ATP to move within the mebrane
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2. What is not part of the Fluid Mosaic model?

  • Constantly moving and diffrent shapes
  • Glycolipids
  • Cholesterol
  • Phosopholipid bilayer
  • Proteins
  • Used for cell signalling
  • 7-10nm thick

3. 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

4. What is cell signalling not used for?

  • Movement of molecules from an area of high concentration to low
  • Some drugs that treat depression like diazepan mimic a neurotransmitter
  • Hormones will attach to a receptor of target cells and internal response is triggered
  • Drugs like beta- blockers or aspirin will bind to certain receptors on cells

5. What is active transport?

  • Movement of ion across membranes through protein pumps that use ATP to move within the mebrane
  • Net movement of molecules from an area of high concentration to an area of low concentration

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