How many types of RNA polymerase required for RNA synthesis ?

Options

A. In prokaryotes, three different types of RNA polymerase are required, where RNA polymerase II transcribes mRNA genes and 5S rRNA genes.
B. In eukaryotes, three different types of RNA polymerase are required, where RNA polymerase II transcribes mRNA genes and 5S rRNA genes.
C. In eukaryotes, three different types of RNA polymerase are required, where RNA polymerase II transcribes mRNA and hnrna
D. In eukaryotes, five different types of RNA polymerase are required, where RNA polymeraseIII transcribes mRNA, miRNA snRNA and snoRNA qenes.

Answer

### Step-by-Step Solution:

1. **Understanding RNA Polymerases**:
- RNA polymerases are enzymes responsible for synthesizing RNA from a DNA template. They play a crucial role in the transcription process.

2. **Types of RNA Polymerases in Prokaryotes**:
- In prokaryotes (like bacteria), there is only **one type of RNA polymerase**. This single enzyme is responsible for synthesizing all types of RNA, including mRNA, rRNA, and tRNA.

3. **Types of RNA Polymerases in Eukaryotes**:
- In eukaryotes (like plants and animals), there are **three different types of RNA polymerases**:
- **RNA Polymerase I**: Synthesizes all ribosomal RNA (rRNA) except for 5S rRNA.
- **RNA Polymerase II**: Synthesizes messenger RNA (mRNA) and heteronuclear RNA (hnRNA).
- **RNA Polymerase III**: Synthesizes transfer RNA (tRNA), 5S rRNA, and other small RNAs.

4. **Conclusion**:
- Therefore, the answer to the question is:
- In **prokaryotes**, **1 type** of RNA polymerase is required.
- In **eukaryotes**, **3 types** of RNA polymerases are required.

### Final Answer:
- **1 type of RNA polymerase in prokaryotes** and **3 types of RNA polymerases in eukaryotes**.

---