How many RNA polymerase are present in a bacterial system ?

Options

A. 4
B. 2
C. 1
D. 3

Answer

To determine how many RNA polymerases are present in a bacterial system, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding RNA Polymerase**: In prokaryotic organisms, such as bacteria, RNA polymerase is the enzyme responsible for synthesizing RNA from a DNA template during the process of transcription.

2. **Identifying the Number of RNA Polymerases**: Unlike eukaryotic cells, which have multiple types of RNA polymerases (RNA polymerase I, II, and III), bacteria typically have only one type of RNA polymerase.

3. **Structure of Bacterial RNA Polymerase**: The bacterial RNA polymerase is a multi-subunit enzyme. It consists of four catalytic subunits and one sigma (σ) factor, which is a regulatory subunit that helps the enzyme recognize the start of genes.

4. **Conclusion**: Since bacteria have only one type of RNA polymerase that performs all transcriptional functions, the correct answer to the question is that there is **1 RNA polymerase in a bacterial system**.

### Final Answer:
The number of RNA polymerases present in a bacterial system is **1**.

---