lipids 3.1.3



  • triglycerides and phospholipids are two groups of lipid.
  • Triglycerides are formed by the condensation of one molecule of glycerol and three molecules of fatty acid. (
  • a condensation reaction between glycerol and a fatty acid (ROOH) forms and ester bond.
  • the R-group of a fatty acid my be saturated (only single carbon bonds ) or unsaturated (at least one double carbon bond)
  • In phospholipids, one of the fatty acids of a triglyceride is substituted by a phosphate-containing group. (
    • the presence of the phosphate group means that the ‘head’ is attracted to water (hydrophilic).
    • the hydrocarbon tails do not mix with water (hydrophobic)
    • when mixed with water they arrange themselves in a double layer with their hydrophobic tails pointing inwards and their


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