Lipids - structure and function

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  • Lipids
    • Triglyceride
      • CH2OH CHOH CH2OH
      • COOH------ COOH------ COOH------
        • CH2OOC------ CHOOC------- CH2OOC------
          • CH2OH CHOH CH2OH
      • Condesation reaction
        • Phospholipid
          • Same as triglyceride but phosphate group replaces 1 fatty acid chain
          • Non-polar = insoluble
          • Ester bond
      • Ester bond
      • Non-polar = insoluble
      • Glycerol + 3 fatty acids
    • Phospholipid
      • Same as triglyceride but phosphate group replaces 1 fatty acid chain
    • Function
      • Insulation against heat loss (under skin)
      • Protection of internal organs against external forces
      • Produce metabolic water (triglyceride) for kangaroos
      • Form bilayer in cell membranes (phospholipids)
      • Energy storage - yield x2 as much energy in 1g than 1g carbohydrate
      • Waterproofing
        • Waxy cuticle on plant lead

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