Question

within a polypeptide chain is the following amino acid sequence, which reads in the n terminus to c terminus direction from left to right: glycine - tyrosine - serine. which statement about this polypeptide is true? the side chains or r groups of the amino acids in the sequence are covalently bonded to one another through peptide bonds. a hydrolysis reaction occurred during peptide bond formation between the carboxyl group of glycine and the carboxyl group of tyrosine. a molecule of water was released when the carboxyl group of tyrosine formed a peptide bond with the amino group of serine. the polypeptide can become branched if the side chain of tyrosine reacts with a free amino acid to form a peptide bond. a condensation reaction formed a peptide bond between the amino group of glycine and the carboxyl group of tyrosine.

Explanation:

Peptide bonds are formed between the carboxyl - group of one amino acid and the amino - group of the next amino acid through a condensation reaction (also called dehydration synthesis), releasing a molecule of water. The side chains (R - groups) are not involved in peptide - bond formation between amino acids in the primary sequence. Hydrolysis is the reverse of peptide - bond formation. Peptide bonds form between the main chain groups, not side chains.

Answer:

A molecule of water was released when the carboxyl group of tyrosine formed a peptide bond with the amino group of serine.