In transcription in eukaryotes, heterogenous nuclear RNA (hnRNA)is transcribed by

Options

A. RNA polymerase I
B. RNA polymerase II
C. RNA polymerase III
D. all of these.

Explanation

To solve the question regarding which enzyme transcribes heterogeneous nuclear RNA (hnRNA) in eukaryotes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of RNA in Eukaryotes**:
- Eukaryotic cells contain several types of RNA, including mRNA, tRNA, and rRNA. Heterogeneous nuclear RNA (hnRNA) is a precursor to mRNA.

2. **Identify RNA Polymerases**:
- Eukaryotic cells have three main types of RNA polymerases:
- **RNA Polymerase I**: Primarily transcribes rRNA (except 5S rRNA).
- **RNA Polymerase II**: Transcribes mRNA and hnRNA.
- **RNA Polymerase III**: Transcribes tRNA, 5S rRNA, and small nuclear RNAs.

3. **Focus on hnRNA**:
- Since hnRNA is a precursor to mRNA, it is specifically transcribed by RNA Polymerase II.

4. **Conclusion**:
- Therefore, the enzyme responsible for transcribing heterogeneous nuclear RNA (hnRNA) in eukaryotes is **RNA Polymerase II**.

### Final Answer:
Heterogeneous nuclear RNA (hnRNA) in eukaryotes is transcribed by **RNA Polymerase II**.

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