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 will analyze the options provided and identify their roles in prokaryotic transcription.

### Step-by-Step Solution:

1. **Identify the Components of Prokaryotic RNA Polymerase**:
- Prokaryotic RNA polymerase is composed of several subunits, including:
- **Alpha (α)**: This subunit is involved in the assembly of the enzyme and helps in the binding of regulatory proteins.
- **Beta (β)**: This subunit plays a crucial role in the catalytic activity of RNA synthesis.
- **Sigma (σ)**: This factor is essential for the initiation of transcription as it helps the RNA polymerase to recognize the promoter region of the DNA.

2. **Evaluate the Options**:
- The question asks which factor is not part of prokaryotic RNA polymerase. The options provided are:
- **Beta (β)**: Present in prokaryotic RNA polymerase.
- **Alpha (α)**: Present in prokaryotic RNA polymerase.
- **Sigma (σ)**: Present in prokaryotic RNA polymerase.
- **Rho (ρ)**: This is a termination factor that is not part of the RNA polymerase complex itself but is involved in the termination of transcription in prokaryotes.

3. **Conclusion**:
- Among the options, Rho (ρ) is the only factor that is not a part of prokaryotic RNA polymerase. Rho is involved in the termination of transcription but does not form a part of the RNA polymerase enzyme.

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

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