What statements are true about the biological macromolecules. All living things are made up of four classes of biological macromolecules: carbohydrates, lipids, proteins, and nucleic acids.
Macromolecules are large molecules composed of thousands of covalently connected atoms, also called polymers. A polymer is a long molecule consisting of many similar building blocks; the small building-block molecules are called monomers.

All cells have thousands of different macromolecules, that vary among cells of an organism, vary more within a species, and vary even more between species. A huge variety of polymers can be built from a small set of monomers.