Observe the given figure and answer the question.
Match List - I with List - II.
| List - I Structure | List - II Label |
| (A) Methyl Guanosine Triphosphate | (I) A |
| (B) Intron | (II) I |
| (C) Poly A tail | (III) C |
| (D) Fully processed hn RNA | (IV) H |
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) - (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
| List - I Structure | List - II Label |
| (A) Methyl Guanosine Triphosphate | (III) C |
| (B) Intron | (I) A |
| (C) Poly A tail | (IV) H |
| (D) Fully processed hn RNA | (II) I |
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.
