…………. can terminate transcription.

Options

A. TATA Box
B. `rho`
C. `sigma`
D. `rho-X`

Explanation

To answer the question "………. can terminate transcription," we need to identify the correct factor that plays a role in terminating the transcription process in cells.

### Step-by-Step Solution:

1. **Understand Transcription**: Transcription is the process where DNA is converted into messenger RNA (mRNA). This process is crucial for gene expression.

2. **Identify the Options**: The options provided are:
- A) TATA box
- B) Rho factor
- C) Sigma factor
- D) Rho factor and X

3. **Analyze Each Option**:
- **TATA box**: This is a DNA sequence that indicates where a genetic sequence can be read and decoded. It is not involved in termination.
- **Rho factor**: This is a protein that plays a critical role in terminating transcription in prokaryotes. It binds to the RNA and moves along it until it reaches the RNA polymerase, causing it to detach from the DNA.
- **Sigma factor**: This is a protein needed for the initiation of transcription in bacteria, not termination.
- **Rho factor and X**: This option is ambiguous and does not specifically refer to a known factor involved in termination.

4. **Determine the Correct Answer**: Based on the analysis, the Rho factor (option B) is the correct answer as it is specifically known to terminate transcription in prokaryotes.

5. **Conclusion**: Therefore, the answer to the question is **B) Rho factor**.