Biological Membranes

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  • Biological Membranes
    • Structure
      • Glycoproteins
        • Receptor sites, antigens, cell adhesion
          • Glycolipids
      • Glycolipids
      • Integral/peripheral proteins
      • Carrier/channel proteins
      • Cholesterol
        • regulates fluidity
      • Phospholipid bilayer
        • barrier
    • Factors affecting membrane permeability
      • temp
        • high: proteins denature + bilayer more fluid
        • low: sat.fats compress, unsat. kinks
      • solvents
        • change protein bonding
        • bind to phospholipid heads
        • dissolves cholesterol
    • Transport across membrane
      • Passive
        • Osmosis
          • water
          • across bilayer
        • Simple diffusion
          • small uncharged gases and lipid-soluble molecules
          • across bilayer
        • Facilitated diffusion
          • large polar molecules and ions
          • channel protein
      • Active
        • Active transport
          • eg.k+Na+ pump
          • carrier protein
        • Exocytosis
          • eg.insulin
        • Endocystosis
          • eg.pathogens

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