Question

Consider the following statements and choose the correct option.

In eukaryotes

(i) RNA polymerase I transcribes rRNA.
(ii) RNA polymerase I transcribes snRNA.
(iii) RNA polymerases II transcribes tRNA.
(iv) RNA polymerase II transcribes hnRNA.

• A. 1 and 2 are correct.
• B. 1 and 3 are correct.
• C. 1, 2 and 4 are correct.
• D. 2 and 3 are correct.
• E. 1 and 4 are correct.

Answer 1

The correct option is E 1 and 4 are correct.

Eukaryotes have three RNA polymerases which are structurally distinct complexes, though share certain subunits in common, and have a specific function and specific promoter sequence. RNA polymerase I synthesize preribosomal RNA (pre-rRNA), which contains the precursor for the 18S, 5.8S, and 28S rRNAs.

RNA polymerase II transcribes the presursor of mRNA which is heterogenous RNA (hnRNA).

RNA polymerase III makes tRNAs, the 5S rRNA, and sNRNAs.

Therefore, the correct answer is option (E).