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Question:

hnRNA undergoes two additional processes. In one of the processes, an unusual nucleotide (methyl GPT) is added to the 5' end of the molecule. What would you call this?

Termination

Splicing

Capping

Tailing

Solution:

Heterogeneous nuclear RNA undergoes two additional processing known as capping and tailing. In capping process, an unusual nucleotide Methyl guanosine monophosphate (methyl GMP) is added to 5' end in tailing process. Adenylate residues (200-300) are added at 3' end in template independent manner. In splicing, introns are removed and exons are pinned in a definite order. Termination is the ending process in gene expression.