Before forming a peptide bond the amino acid contains a carboxyl group, which reacts with the amine group to produce a peptide bond and water is produced. What is the name for the new groups in an amino residue within a polypeptide, if there are any? Especially the C=O left from the carboxyl group? Submitted by flowergirlhyuck t3_11yjbpc on March 22, 2023 at 1:35 PM in askscience 6 comments 13