The enzyme poly-A polymerase is responsible for adding 3' poly-A tails to eukaryotic mRNAs. This enzyme...
A) cuts the mRNA after recognition of the cleavage/polyadenylation signal by CstF and CPSF proteins.
B) polymerizes the tail using an RNA template that is part of the enzyme.
C) is extremely processive.
D) normally adds about 1000 A nucleotides to the mRNA.
E) uses ATP as a substrate.

Question

Quizplus · Accepted Answer

After the mRNA is cleaved, this enzyme adds about 200 A nucleotides (from ATP) one by one without using a template.

The Enzyme Poly-A Polymerase Is Responsible for Adding 3' Poly-A