The poly(A) tail of an mRNA ____.
A) is where the start codon is located
B) covers the stop codon until it is needed
C) protects the 3' end of the mRNA from attack by RNA-digesting enzymes
D) is where ribosomes attach at the start of translation
E) is where translation terminates

Question

Quizplus · Accepted Answer

The poly(A) tail is added to the 3' end of an mRNA molecule and serves several functions, including protection from enzymatic degradation, aiding in the export of the mRNA from the nucleus, and playing a role in translation initiation. It does not cover the stop codon, serve as the site of the start codon, where ribosomes attach, or where translation terminates.

The Poly(A) Tail of an MRNA ____