monomer of carbohydrates
They are carbohydrates, lipids, proteins and nucleic acids. These polymers are composed of different monomers and serve different functions. 1  Carbohydrates-composed of sugar monomers and necessary for energy storage. 2  Lipids-include fats, phospholipids and steroids.3  Lipids help to store energy, cushion and protect organs, insulate the body and form cell membranes.hese polymers are composed of different monomers and serve different functions. 1  Carbohydrates-composed of sugar monomers and necessary for energy storage. 2  Lipids-include fats, phospholipids and steroids.