Summary Proteins Proteins are a diverse lot of unbranched polymers comprised of small molecules called amino acids. The amino acids polymerize though the formation of peptide bonds. Each kind of protein has a specific sequence of amino acids. Each protein has a different shape. The shape of a protein is dictated by its sequence of amino acids.
Proteins are both structural components and workers in living things.
DNA DNA is a very long polymer comprised of a sequence of small molecules called nucleotides. A, C, G and T. DNA ordinarily consists of two polymers, each one running in opposite directions, intertwined, and held tightly to one another by hydrogen bonds between complementary bases. DNA carries information. RNA RNA, like DNA, is a polymer composed of nucleotides. A, T, C and U. RNA ordinarily consists of one polymer, but base pairing between complementary bases often causes it to fold in complicated arrangements.