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Assertion :During eukaryotic transcription ,in capping an unusual nucleotide (methyl guanosine triphosphate) is added to the 5'-end of hnRNA. |
A is false but R is true . A and R both are true and R is the correct explanation of A . A and R both are true but R is not the correct explanation of A . A is true but R is false . |
A and R both are true but R is not the correct explanation of A . |
The correct answer is Option (3)- A and R both are true but R is not the correct explanation of A . During eukaryotic transcription , the primary transcripts contain both the exons and the introns and are non-functional. Hence, it is subjected to a process called splicing where the introns are removed and exons are joined in a defined order. hnRNA undergoes additional processing called as capping and tailing. In capping an unusual nucleotide (methyl guanosine triphosphate) is added to the 5'-end of hnRNA. In tailing, adenylate residues (200-300) are added at 3'-end in a template independent manner. It is the fully processed hnRNA, now called mRNA, that is transported out of the nucleus for translation. |
