NEETZoologyMolecular Basis of Inheritance
In eukaryotes, there is a clear division of labour among the RNA polymerases. Which of the following statements correctly links an RNA polymerase to its transcript and its subsequent post-transcriptional processing?
Options
- ARNA polymerase II transcribes hnRNA, which undergoes capping, tailing, and splicing within the nucleus before
- BRNA polymerase I is responsible for transcribing hnRNA, which subsequently undergoes the removal of introns an
- CThe transcripts produced by RNA polymerase III undergo the addition of methyl guanosine triphosphate at their
- DThe primary transcript produced by RNA polymerase II is transported to the cytoplasm prior to the removal of i
Correct answer
A. RNA polymerase II transcribes hnRNA, which undergoes capping, tailing, and splicing within the nucleus before
Step-by-step solution
In eukaryotes, there are three types of RNA polymerases in the nucleus. RNA polymerase I transcribes rRNAs. RNA polymerase II transcribes the precursor of mRNA, called heterogeneous nuclear RNA (hnRNA). RNA polymerase III is responsible for the transcription of tRNA, 5srRNA, and snRNAs. The hnRNA undergoes post-transcriptional modifications including capping (addition of methyl guanosine triphosphate at the 5' end), tailing (addition of adenylate residues at the 3' end), and splicing (removal of introns and joining