NEETZoologyMolecular Basis of Inheritance
In eukaryotes, identify the specific RNA polymerases responsible for the transcription of 18S rRNA, hnRNA, and 5S rRNA, respectively.
Options
- ARNA polymerase I, RNA polymerase II, and RNA polymerase I
- BRNA polymerase I, RNA polymerase III, and RNA polymerase II
- CRNA polymerase I, RNA polymerase II, and RNA polymerase III
- DRNA polymerase III, RNA polymerase II, and RNA polymerase I
Correct answer
C. RNA polymerase I, RNA polymerase II, and RNA polymerase III
Step-by-step solution
In the eukaryotic nucleus, there are three distinct RNA polymerases with specific roles: 1. RNA polymerase I transcribes rRNAs (28S, 18S, and 5.8S). 2. RNA polymerase II transcribes the precursor of mRNA, the heterogeneous nuclear RNA (hnRNA). 3. RNA polymerase III is responsible for the transcription of tRNA, 5S rRNA, and snRNAs. Therefore, the correct sequence of enzymes for 18S rRNA, hnRNA, and 5S rRNA is RNA polymerase I, RNA polymerase II, and RNA polymerase III, respectively. A common mistake is assuming all