Problem 13

Background and context

Lipids are macromolecules that provide energy, insulation from the environment, and protection from water. They are important constituents of hormones and cell membranes. They include fats, phospholipids, oils, waxes, and steroids.

Phospholipids are a class of lipids. They are macromolecules that are important constituents of the membrane matrix. They have a backbone of glycerol or sphingosine to which two chains of fatty acids and a phosphate group are combined.