FreeMCATPrep Logo

Support us and cryptocurrency!
Try a browser that's faster, safer, ad-free, and earns you cryptocurrency for using it! W3Schools

More Than 475 Free MCAT Questions with Detailed Answers!

Click HERE for your Random Question from our MCAT Question A Day Archive

Practice MCAT Question - Q66 - Answer!

During which stage(s) of translation is the enzyme peptidyl transferase active?

I. Initiation
II. Elongation
III. Termination

A.  I and II
B.  II and III
C.  I, II, and III
D.  I and III

The correct answer is (B). Peptidyl transferase is needed to: a) attach a newly arrived amino acid at the ribosome’s P site to the existing chain of amino acids already present at the A site; b) detach the tRNA holding the amino acid chain at the A site, once the chain has been attached to the tRNA at the P site; and c) attach the water molecule to the amino acid chain at the P site when a terminator codon is reached. The first two functions are part of elongation, while the third function is part of termination.

Check The Sidebar For Another Practice MCAT Question!! ----->