Which one of the following factors is not a part of prokaryotic RNA Polymerase?

Options

A. beeta
B. alpha
C. sigma
D. rho

Answer

To determine which factor is not a part of prokaryotic RNA polymerase, we need to analyze the components of prokaryotic RNA polymerase.

### Step-by-Step Solution:

1. **Understand the Structure of Prokaryotic RNA Polymerase**:
Prokaryotic RNA polymerase is a multi-subunit enzyme. It is composed of several subunits that come together to form the functional enzyme.

2. **Identify the Subunits**:
The core enzyme of prokaryotic RNA polymerase consists of the following subunits:
- **2 Alpha (α) subunits**
- **2 Beta (β) subunits**
- **1 Sigma (σ) subunit**

This gives a total of five subunits: 2α + 2β + 1σ = 5 subunits.

3. **Evaluate the Options**:
The options given are:
- Beta (β)
- Alpha (α)
- Sigma (σ)
- Rho (ρ)

From the information gathered, we can see that:
- Beta (β) is a part of the RNA polymerase.
- Alpha (α) is also a part of the RNA polymerase.
- Sigma (σ) is included as well.

4. **Identify the Incorrect Factor**:
The only option that does not belong to the prokaryotic RNA polymerase structure is Rho (ρ). Rho is a separate protein involved in the termination of transcription, but it is not a part of the RNA polymerase complex itself.

5. **Conclusion**:
Therefore, the factor that is not a part of prokaryotic RNA polymerase is **Rho (ρ)**.

### Final Answer:
**Rho (ρ)** is not a part of prokaryotic RNA polymerase.