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  4. hn-RNA undergoes two additional processing. Out of which, in one of them an unusual nucleotide (methyl guanosine triphosphate) is added to the 5'-end of hn RNA. This is known as

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Q. $hn-RNA $ undergoes two additional processing. Out of which, in one of them an unusual nucleotide (methyl guanosine triphosphate) is added to the $5'$-end of $hn\,RNA.$ This is known as

AIIMSAIIMS 2009

Solution:

Heterogenous nuclear RNA ( $h n$ RNA) undergo two additional processing known as capping and tailing.
In Caping an unusual nucleotide (methyl guanosinetriphosphate) is added to the $5'$ end of $h n$ RNA. In tailing, a adcnlatc residues $(200-300)$ are added at $3'$ end in template independent manner.
In splicing, introns are removed and exons are joined in a definite order.