Lipids

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  • Created by: kim.a.r
  • Created on: 27-03-14 15:40
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  • Lipids
    • Properties
      • If the hydrocarbon has no C=C bonds then the fatty acid is saturated as ALL the C atoms are linked to the max no. of H atoms
      • If there are C=C bonds present then the fatty acid is unsaturated, as it contains less H atoms
      • A high intake of fats (saturated) contributes to heart disease
      • Lipids are insoluble in water but dissolve in organic solvents e.g. acetone and alcohols
    • Roles
      • A major role in the plasma membrane
      • Make excellent energy reserves
        • Because they consists of more C-H bonds than carbohydrates
      • Act as an insulator under the skin
      • protection around delicate internal organs
      • Triglycerides produce a lot of metabolic water when oxidised
      • Waterproofing in the waxy cuticle of insects and plants
    • Phospholipids
      • Have an end which is soluble in water
      • A fatty acid is replaced with a phosphate group
      • Are important in the formation of the plasma membrane in cells
    • A non-polar compounds that is insoluble in water
    • Triglycerides are formed by 1 glycerol + 3 fatty acids
    • The glycerol molecule is always the same but the fatty acids vary
    • They are joined by condensation reaction, where 3 water molecules are removed
    • Ester bonds are formed between the fatty acids and the glycogen

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