Which ONE of the following nuclear RNA processing events is correct?
A) Many RNA transcripts have a cap of 7-methyl-guanine added to the end of the RNA.
B) The splice sites in precursors to mRNA are initially recognized by an enzyme that marks them by methylation.
C) A poly G tail of up to about 200 guanine residues is added to the end of most pre-mRNA molecules.
D) The 5'-end of many RNAs is capped using a 5'-5' pyrophosphate link.
E) After synthesis of RNA on the DNA template, ribothymidine residues in the RNA are demethylated to uridine residues.

Question

Quizplus · Accepted Answer

The 5'-end of many RNAs is capped with a unique structure involving a 5'-5' triphosphate link to a 7-methylguanosine. This cap structure is critical for RNA stability, export from the nucleus, and translation initiation in eukaryotes. The other options describe processes that do not accurately represent RNA processing events.

Which ONE of the Following Nuclear RNA Processing Events Is