Which One of the Following Nuclear RNA Processing Events Is

Multiple Choice

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 link.
E) After synthesis of RNA on the DNA template, ribothymidine residues in the RNA are demethylated to uridine residues.