Fluid Mosaic Model

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  • Created by: Steff06
  • Created on: 04-04-16 11:25
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  • Glycoproteins and glycolipids:
    • Some phospholipid molecules and some of the proteins in the membrane have a small carbohydrate part attached to them.
    • Where PHOSPHOLIPID molecules have a carbohydrate part attached, they are called GLYCOLIPIDS.
    • Where PROTEINS have a carbohydrate part attached, they are called GLYCOPROTEINS.
    • The Fluid Mosaic Model
      • Membrane stability + fluidity:
        • CHOLESTEROL gives membranes of EUKARYOTIC cells STABILITY.
          • Cholesterol fits between fatty acid tails and makes the barrier more complete so substances e.g. water and ions cannot pass easily/directly through the membrane.
      • Membrane transport:
        • CHANNEL proteins allow movement across the membrane. Some molecules are too large/hydrophilic to pass through the bilayer. So they enter+leave cells using these protein channels.
        • CARRIER proteins actively move substances across the membrane. E.g. Mg+ ions are actively pumped using ATP energy into root hair cells from soil.
      • Recognition and communication:
        • RECEPTOR SITES - Hormones bind to the cell so a response can be carried out. Can only bind with a receptor.
        • GLYCOLIPIDS and GLYCOPROTEINS involved in cell signalling. Act as hormone receptor.
      • Metabolic processes:
        • ENZYMES and COENZYMES. Reactions in photosynthesis + respiration happen in membranes. Enzymes and coenzymes may be bound to these membranes.
      • Membranes and temperature:
        • INCREASING temperature increases KINETIC ENERGY, so they move faster and makes membranes LEAKY.
          • Leaky means substances that would not normally do so can enter/leave the cell.


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