Lipids

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  • Lipids
    • triglycerides
      • fats- saturated, solid, animals
      • glycerol molecule + 3 fatty acids
        • bonded by condensation reactions
        • released by hydrolysis reactions
          • ester bonds
            • bonded by condensation reactions
      • oils - unsaturated, liquid, plants
    • phospholipids
      • glycerol molecule + 2 fatty acid residues + phosphate group
      • phosphate causes glycerol end to be polarised = soluble in water/hydrophilic
      • fatty acid tails are non-polar = insoluble in water/hydrophobic
        • form bilayers
          • phosphate causes glycerol end to be polarised = soluble in water/hydrophilic
    • fatty acids
      • long hydrocarbon chains with a carboxylic acid group at one end
        • saturated
          • single bonds only
        • unsaturated
          • hydrocarbon chain with double bonds
    • Functions
      • thermal insulating layer in mammals
      • buoyancy in marine mammals
      • cushioning layer/protection to internal organs
    • cholesterol
      • hydrocarbon tail + 4 carbon-based rings
        • found in cell membranes (hydrophobic)

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