The four main types of biomolecules are carbohydrates, lipids, proteins, and nucleic acids. Carbohydrates are made up of carbon, hydrogen, and oxygen atoms, and they include sugars, starches, and cellulose. Lipids are made up of carbon, hydrogen, and oxygen atoms, and they include fats, oils, and waxes. Proteins are made up of amino acids, and they include enzymes, antibodies, and hormones. Nucleic acids are made up of nucleotides, and they include DNA and RNA. These biomolecules are essential for the structure and function of all living things.