HUMAN NUTRITION

Detailed explanation-1: -Four major types of macromolecules-proteins, carbohydrates, nucleic acids, and lipids-play these important roles in the life of a cell. In terms of overall structure, all macromolecules except the lipids are considered polymers.

Detailed explanation-2: -Lipids are a hydrophobic set of macromolecules, i.e., they do not dissolve in water.

Detailed explanation-3: -Because of nature and their large size, they are classified as macromolecules. Lipids are not usually polymers and are smaller than the other three i.e. carbohydrates, proteins, and nucleic acid.