A) splicing
B) capping
C) tailing .
D) All of the above
Correct Answer: D
Solution :
The heterogeneous nuclear RNA (hn RNA) is the precursuor of mRNA, It undergoes splicing, capping and tailing during the process. In E splicing, the introns are removed and exons are joined in a defined order hn RNA undergoes someone processing called as capping and tailing. In capping an unusual nucleotide (methyl guanosine triphosphate) is added to the 5-end of hn RNA. In tailing, adenylate residues (200-300) are added at 3-end in a template independent manner. It is the fully processed hn RNA, now called mRNA. It is transported out of the nucleous for translation.
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