Which of the following is NOT one of the functions of lipids? A. forming the exoskeletons of insects
B. forming waxy leaf coverings
C. storing energy in fat cells
D. forming cell membranes

A function that is not characteristic of lipids is forming the exoskeleton of insects.

Explanation:

The exoskeleton is a rigid external structure that provides support and protection to animals such as insects.

The structure of exoskeletons is formed, especially in insects, by chitin. Chitin in turn is made up of N-acetyl-glucosamine, which when polymerized forms the hard and resistant layer that forms the external cover of the insects. Exoskeletons do not contain lipids in their composition.

The other options are correct with respect to the function of the lipids:

    B. Hydroxy fatty acid form the waxy layer that covers the leaves of the plants.

    C. Lipids are a reserve energy source, stored in the fatty cells.

    D. Phospholipids are the main component of cell membranes.