cell membrane structure

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  • cell membrane structure
    • phospholipids
      • bilayer
        • hydrophobic tail
        • hydrophilic head
        • phosphate group is polar and so is soluble
      • flexible
        • fluid mosaic model
    • proteins
      • scattered  throughout the bilayer
        • fluid mosaic model
      • channel proteins
        • allow large molecules to pass through
          • carrier proteins
      • carrier proteins
      • receptor proteins
        • detect chemicals released from other cells
          • e.g. insulin binds to receptor proteins on liver cells which tell the cell to absorb glucose
      • some can move throughout, some are static
      • mechanical support
    • glycoproteins
      • proteins with a polysaccharide chain attached
      • recognition sites
        • important for lymphocytes and immune function
      • receptors
    • glycolipids
      • lipids with polysaccharide chain attached
      • recognition sites
        • important for lymphocytes and immune function
      • stabilise membrane
        • glycoproteins
          • proteins with a polysaccharide chain attached
          • receptors
    • cholesterol
      • type of lipid
      • make phospholipdsless fluid
      • prevent leakage of water and ions
      • binds to hydrophobic tails of phospholipids causing them to pack closer together

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