There are two types of lipid of interest to an A level biologist: triglycerides and phospholipids. Both play important roles in living organisms.
These are characterised by a glycerol molecule with three fatty acid ‘tails’. The bond between the glycerol and fatty acid is known as an ester bond and is formed by a condensation reaction where water is produced. Hydrolysis is the reverse process and used to digest triglycerides. This is very similar to condensation and hydrolysis of carbohydrates. The actual structural formula of a triglyceride is shown below, with the glycerol…
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