5  capping of mRNA transcripts in eukaryotes involves the following events:
P. Addition of GMP on the 5 end
Q. Removal of -phosphate of the triphosphate on first base at the 5 end
R. 5-5 linkage between GMP and the first base at 5 end
S. Addition of methyl group to N7 position of guanine
Which one of the following is the correct sequence of events?
(A) P, Q, R, S (B) P, R, Q, S
(C) Q, P, R, S (D) Q, P, S, R

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