Small neclear RNA is transcribed by

Options

A. RNA Polymerase I
B. RNA Polymerase III
C. RNA Polymerase II
D. Both (1) and (3)

Answer

**Step-by-Step Solution:**

1. **Understanding Small Nuclear RNA (snRNA):**
- Small nuclear RNA is a type of RNA found in the nucleus of eukaryotic cells.
- It plays a crucial role in the process of splicing, which is the removal of introns from pre-mRNA.

2. **Identifying the Enzyme Responsible for Transcription:**
- In eukaryotic cells, different types of RNA are transcribed by specific RNA polymerases.
- The question asks which enzyme is responsible for transcribing small nuclear RNA.

3. **Reviewing the Functions of RNA Polymerases:**
- **RNA Polymerase I:** Primarily transcribes rRNA (ribosomal RNA) except for 5S rRNA.
- **RNA Polymerase II:** Transcribes mRNA (messenger RNA) and some snRNA, but not specifically small nuclear RNA.
- **RNA Polymerase III:** Responsible for transcribing small nuclear RNA, tRNA (transfer RNA), and 5S rRNA.

4. **Conclusion:**
- Based on the functions of the RNA polymerases, it is clear that small nuclear RNA is transcribed by **RNA Polymerase III**.

5. **Final Answer:**
- Therefore, the correct answer is RNA Polymerase III.

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