Target Exam

CUET

Subject

Biology

Chapter

Molecular Basis of Inheritance

Question:

RNA polymerase III is responsible for transcription of -

Options:

rRNAs

hnRNA

tRNA, 5srRNA, and snRNAs

ds RNA

Correct Answer:

tRNA, 5srRNA, and snRNAs

Explanation:

The correct answer is Option (3) → tRNA, 5srRNA, and snRNAs

In eukaryotes, there are  at least three RNA polymerases in the nucleus (in addition to the RNA polymerase found in the organelles). There is a clear cut division of labour.

(i) The RNA polymerase I transcribes rRNAs (28S, 18S, and 5.8S).

(ii) RNA polymerase III is responsible for transcription of tRNA, 5srRNA, and snRNAs (small nuclear RNAs).

(iii) The RNA polymerase II transcribes precursor of mRNA, the heterogeneous nuclear RNA (hnRNA).