Problem:

Question: What characteristic of lipids accounts for the separation of oil into droplets in salad dressing even after vigorous shaking?

a) Lipids in salad dressing have functional groups that repel water.

b) Lipids form ester links.

c) Some lipids have double bonds between the carbon atoms in their fatty acid chain.

d) Lipids are hydrophobic.

e) Lipids are hydrophilic.

Provide the correct answer and justification for your choice.