In mammalian cells employed in pulse-chase experiments, radiolabeled methyl groups appear first in which size RNA molecule that is a precursor to rRNA?
A)65S RNA
B)45S RNA
C)28S RNA
D)18S RNA
E)5.8S RNA

Question

Quizplus · Accepted Answer

The precursor to rRNA is the 45S RNA, which is transcribed from the rDNA. Radiolabeled methyl groups appear first in the 45S RNA during pulse-chase experiments. The 45S RNA is processed into 18S, 5.8S, and 28S rRNA molecules.

In Mammalian Cells Employed in Pulse-Chase Experiments, Radiolabeled Methyl Groups