Elongation of the polypeptide continues as long as a new tRNA molecule situates in the:
A)E site of the ribosome.
B)P site of the ribosome.
C)A site of the ribosome.
D)M site of the ribosome.

Question

Quizplus · Accepted Answer

Elongation of the polypeptide chain occurs when a new aminoacyl-tRNA binds to the A site of the ribosome, bringing a new amino acid to be added to the growing chain. The ribosome then catalyzes the formation of a peptide bond between the amino acid in the A site and the carboxyl end of the growing chain in the P site. The tRNA in the P site then moves to the E site and is released, while the tRNA in the A site moves to the P site, allowing the next incoming aminoacyl-tRNA to bind to the now-empty A site.

Elongation of the Polypeptide Continues as Long as a New