The reaction between two molecules of
similar or different amino acids, proceeds through
the combination of the amino group of one molecule
with the carboxyl group of the other This results in
the elimination of a water molecule and formation of
a peptide bond –CO–NH– The product of the reaction
is called a dipeptide because it is made up of two
amino acids For example, when carboxyl group of
glycine combines with the amino group of alanine
we get a dipeptide, glycylalanine