Proteins Are Large Biomolecules, Or Macromolecules, Consisting Of One Or More Long Chains Of Amino Acid Residues. Protein Structur Royalty-Free Stock Photography

Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues. A protein contains at least one long polypeptide. Short polypeptides, containing less than 20–30 residues, are rarely considered to be proteins and are commonly called peptides, or sometimes oligopeptides.