cell surface membrane

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  • Cell-surface membrane
    • Fluid-mosaic model.
      • Fluid - phospholipids can move relative to one another so it is contantly moving.
      • Mosaic - proteins embedded in the bilayer vary in size, shape and pattern.
    • Phosoholipids
      • Form a bilayer
      • One layer has its heads interacting the water outside the cell while the other deals with the water inside the cell.
      • Alloe lipid soluble material to entre and leave.
      • Prevent water soluble material entering and leaving the cell.
      • Make the membrane flexible.
    • Proteins
      • Intrinsic
        • Completely span the bilayer
        • Act as carriers for water soluble material
      • Extrinsic
        • Occur on the surface or partially embedded in the bilayer
        • Give mechanical support
        • Act as receptors
  • One layer has its heads interacting the water outside the cell while the other deals with the water inside the cell.

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