n.
Organic compound composed of a series of amino acid s linked by peptide bonds (see covalent bond ) between a carbon atom of one and a nitrogen atom of the next.
Peptide chains longer than a few dozen amino acids are called protein s. Biosynthesis of peptides from a succession of amino acids carried by transfer RNA molecules takes place on ribosome s and is catalyzed and controlled by enzyme s. Many hormone s, antibiotic s, and other compounds that participate in life processes are peptides.