A macromolecule is a very large molecule, such as a protein, nucleic acid, or synthetic polymer, composed of thousands or more atoms. These molecules are typically characterized by their large size and complex structure, which is a result of the polymerization of smaller subunits called monomers. noun
Proteins are macromolecules that perform a vast array of functions within organisms.
DNA is a macromolecule that carries genetic information crucial for the development and functioning of living organisms.