lipids

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Triglycerides are a kind of lipid

  • A triglyceride is made of one molecule of glycerol with three fatty acids attached to it 
  • These fatty acids have long tails made of hydrocarbons. The tails are also hydrophobic.therefore the lipids are insoluble in water
  • all fatty acids consist of the same basic structure BUT the hydrocarbon tail vaires due to the vairable R group

Phospholipids are similar to triglycerides

  • Lipids found in cell membranes are called PHOSPHOLIPIDS and are not triglycerides. - one fatty acid molecule is replaced with a phosphate group
  • the phosphate group is ionised  (electically charged) which makes it attact water molecules- causing the structure to form a bilayer as the phosphate heads face

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