All of the following statements about the essential carboxy terminal domain (CTD)of RNA polymerase are true except:
A)The CTD is present in RNA polymerase I,II,and III.
B)The CTD can become phosphorylated.
C)The CTD is critical for viability.
D)The CTD of mammals contains more than 50 repeats of a heptapeptide.

Question

Quizplus · Accepted Answer

The essential carboxy terminal domain (CTD) is a characteristic feature of RNA polymerase II, not RNA polymerase I and III. The CTD's phosphorylation, its critical role in viability, and the presence of more than 50 repeats of a heptapeptide in mammals are all true for RNA polymerase II.

All of the Following Statements About the Essential Carboxy Terminal