Cell Membranes (Mindmap)

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  • Cell Membranes
    • Phospholipids
      • Can form bilayers
        • This forms the basis of the membrane.
      • They have a hydrophilic head and a hydrophobic tail.
        • They have their hydrophilic heads facing outside the membrane
          • Can form bilayers
            • This forms the basis of the membrane.
          • Hydrophobic tail point towards the center of the membrane.
        • On the other layer, they have their hydrophilic heads facing inside the membrane; in to the cell.
          • Hydrophobic tail point towards the center of the membrane.
      • Are lipid soluble, but not water soluble; creating the need for transport proteins.
      • Phospholipids are mad up of a glycerol molecule, 2 fatty acid tails and a phosphate group.
        • The phosphate group in the molecule makes the phospholipid polar.
    • Proteins
      • In the phospholipid bilayer there are proteins.
        • Types of protein
          • Extrinsic proteins occur on the surface of the bilayer
            • Extrinsic proteins are used for structure.
          • Intrinsic proteins extend across both layers.
            • Intrinsic proteins are generally used for transportation of non-lipid soluble substances.
              • Are lipid soluble, but not water soluble; creating the need for transport proteins.
    • Fluid Mosaic
      • This is the name of the model given to the cell membrane.
      • Its said to be fluid as the phospholipids are able to move relative to each other.
      • The mosaic part derives from the way in which proteins in the layer vary in shape, size and pattern,

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