Question

Peptidyl transferase _________

a. charges a trna with the appropriate amino acid.
b. catalyzes the formation of a peptide bond between the amino group of the amino acid in the exit site and the carboxyl group of the amino acid in the peptidyl site.
c. catalyzes the formation of a peptide bond between the amino group of the amino acid in the peptidyl site and the carboxyl group of the amino acid in the aminoacyl site.
d. more than one of the above is correct.

Answer 1

c. catalyzes the formation of a peptide bond between the amino group of the amino acid in the peptidyl site and the carboxyl group of the amino acid in the aminoacyl site.

Peptidyl transferase catalyzes the formation of a peptide bond during the elongation phase of protein synthesis, specifically between the A-site tRNA's amino acid and the P-site tRNA's amino acid.

Step-by-step explanation:

Peptidyl transferase catalyzes the formation of a peptide bond between the amino group of the amino acid attached to the A-site tRNA and the carboxyl group of the amino acid attached to the P-site tRNA.

This enzymatic activity is part of the elongation phase of protein synthesis where the growing polypeptide chain is elongated one amino acid at a time. This ribozyme is an integral part of the 50S ribosomal subunit and plays a crucial role in the synthesis of proteins.

Therefore, the correct answer to the student's question is (c) catalyzes the formation of a peptide bond between the amino group of the amino acid in the peptidyl site and the carboxyl group of the amino acid in the aminoacyl site.