Lipids 2 - Phospholipids and cholesterol

Question 1

Structure

Answer 1

> same structure as triglycerides except one fatty acid is replaced with a phosphate

Question 2

Behaviour in water

Answer 2

> phosphate group has a negative charge (polar) so attracted to water
fatty acid tails are non polar so repel water
hydrophillic/hydrophobic

Question 3

Cholesterol

Answer 3

> not made from glycerol or fatty acids
> 4 carbon rings
> small and hydrophobic
> regulates the fluidity of the membrane
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