phospholipid bilayer/fluid mosaic model

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  • The Plasma Membrane
    • phospholipid bilayer
      • hydrophobic tails
        • 'water hating'
      • hydrophilic head
        • 'water loving'
    • Intrinsic protein
      • these allow larger molecules to pass through the membrane
    • extrinsic protein
      • usually attach to proteins to create glycoprotein
        • glycoprotein
          • these are receptors for the cells
    • glycoprotein
      • these are receptors for the cells
    • Carbohydrate Branch
      • these bond with lipids and proteins to create receptor molecules
    • Glycolipid
      • act as receptor molecules
    • Fluid Mosaic Model
      • a double bilayer that contains moving phospholipids, proteins and carbohydrate
    • triglycerides
      • a glycerol molecule bonded with 3 fatty acid tails
        • they bond using condensation reactions to form ester bonds
    • Emulsion test
      • add ethanol to substance, shake and add to water
        • if lipids are present solution goes milky colour
    • phospholipids
      • made of 2 fatty acids, 1 glycerol and a phosphate molecule
        • tails repel water and the head attracts water causing proteins channels when the phospholipids curl up
    • diffusion is the net movement of particles from a high to low concentration, this is how substances are exchanged
      • larger surface area means faster diffusion
      • higher concentration gradient increases diffusion rate
      • thinner exchange surface increases the rate of diffusion
    • osmosis is the net movement of particles from a high water potential to a low one
      • uses partially permeable membrane
    • facilitated diffusion
      • carrier proteins
        • a large molecule that cant diffuse over the membrane used carrier proteins
          • Untitled
      • protein channels
        • allows charged particles to pass over the membrane


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