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Explain the post transcriptional modifi...

Explain the post transcriptional modifications the hn-RNA undergoes in eukaryotic cell.

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hn-RNA is designated as heterogenous nuclear RNA. The precursor of mRNA, i.e., hn-RNA, contains both introsn and exons. Introns are removed and exons are joined by a process called splicing. The remaining mRNA is processed in two ways :
(i) Capping : An usual nucleotide (7-methyl guanasine) is added to 5' end of the transcript.
(ii) Taiting : Adenylate residues (200-300) are added at 3' end in a template independent manner. When hn-RNA is full processed, it is known as mRNA, which is transported out of the nucleous.
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