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

To answer the question about how many types of RNA polymerases are required for RNA synthesis, we can break down the information as follows:

### Step-by-Step Solution:

1. **Understanding RNA Polymerases in Prokaryotes:**
- Prokaryotes, such as bacteria, have a single type of RNA polymerase. This single RNA polymerase is responsible for synthesizing all three types of RNA: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA).
- Therefore, in prokaryotes, there is **1 type of RNA polymerase** that synthesizes mRNA, tRNA, and rRNA.

2. **Understanding RNA Polymerases in Eukaryotes:**
- Eukaryotes, such as plants and animals, have three distinct types of RNA polymerases:
- **RNA Polymerase I**: Synthesizes ribosomal RNA (rRNA) except for 5S rRNA.
- **RNA Polymerase II**: Synthesizes messenger RNA (mRNA) and heterogeneous nuclear RNA (hnRNA).
- **RNA Polymerase III**: Synthesizes transfer RNA (tRNA), 5S rRNA, and small nuclear RNAs (snRNAs).
- Therefore, in eukaryotes, there are **3 types of RNA polymerases**.

3. **Conclusion:**
- In summary, prokaryotes have **1 type of RNA polymerase**, while eukaryotes have **3 types of RNA polymerases**. The question asks how many types are required for RNA synthesis in general, which would depend on the organism type being referred to. However, if we consider both prokaryotes and eukaryotes, the answer would be that there are **1 type in prokaryotes and 3 types in eukaryotes**.

### Final Answer:
- Prokaryotes: 1 type of RNA polymerase.
- Eukaryotes: 3 types of RNA polymerases.