Match List-I with List-II
| List-I Terms related to RNA | List-II Features |
|---|---|
| (A). Capping | (I). Transcribes rRNAs |
| (B). Polyadenylation | (II). Removal of introns |
| (C). RNA polymerase I | (III). 5' end-methyl guanosine triphosphate addition |
| (D). Splicing | (IV). Addition of 200-300 adenylate residues |
Choose the correct answer from the options given below.
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
(A) Capping — this matches (III) 5' end-methyl guanosine triphosphate addition. In capping, an unusual nucleotide, methyl guanosine triphosphate, is added to the 5′ end of the hnRNA. It is one step of processing in eukaryotes.
(B) Polyadenylation — this matches (IV) Addition of 200-300 adenylate residues. This is also called tailing. Adenylate residues are added at the 3′ end without any template.
(C) RNA polymerase I — this matches (I) Transcribes rRNAs. Eukaryotes have three RNA polymerases. RNA polymerase I makes the rRNAs (28S, 18S and 5.8S), polymerase II makes hnRNA and polymerase III makes tRNA, 5S rRNA and snRNAs.
(D) Splicing — this matches (II) Removal of introns. Introns are non-coding parts of the hnRNA. In splicing the introns are cut out and the exons are joined in order.