what are a kind of macromolecule?
Macromolecules of Life. Biological systems are made up of four major macromolecules: Carbohydrates, Lipids, Nucleic acids and Proteins. Macromolecules are large molecules that are composed of smaller units. The four major macromolecules are carbohydrates, lipids, nucleic acids, and proteins. Carbohydrates Carbohydrates are the most abundant macromolecules on earth, and they are the source of immediate energy needs in living systems.