Peptides are amides formed by the interactions between amino
group and carboxyl groups. The bond joining the α-amino group of one amino acids and
the α-carboxyl group of another amino acid is known as the peptide bond.
Two
amino acids react to form a dipeptide; three amino acids to form a tripeptide;
and so on
If a number of amino acids are linked by peptide bonds, a polypeptides is formed. A polypeptides chain has an amino end and a carboxyl end. It consists of a regularly repeating part or main chain and a variable part (indicated by R) or side chain.
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