1. Which parts of the amino acids AA1 and AA2 are involved in the formation of
a peptide bond? AA1-AA2 (A) amino group of AA1 and carboxyl group of AA2
(B) carboxyl group of AA1 and amino group of AA2 (C) carboxyl group of AA1
and side chain of AA2 (D) side chains of both AAl and AA2