The tRNA moves between three sites along the ribosome: A, E, and P.In chronological order, what is the pattern of residence of a given tRNA molecule at those sites?
A) A, then E, then P
B) A, then P, then E
C) E, then P, then A
D) P, then A, then E
E) P, then E, then A

Question

Quizplus · Accepted Answer

The tRNA molecule moves from the A site (aminoacyl site) to the P site (peptidyl site) to form peptide bonds with the growing polypeptide chain, and then to the E site (exit site) before being released from the ribosome. Therefore, the pattern of residence of a given tRNA molecule at those sites is A, then P, then E.

The TRNA Moves Between Three Sites Along the Ribosome: A