Transcription starts at:

Options

A. Terminator region
B. Anywhere on DNA
C. Intron
D. Promoter region

Answer

**Step-by-Step Text Solution:**

1. **Understanding Transcription**: Transcription is the process by which a specific segment of DNA is copied into RNA. This process is essential for gene expression.

2. **Identifying Key Regions**: In the context of transcription, there are specific regions in the DNA that play crucial roles:
- **Promoter Region**: This is the region where RNA polymerase binds to initiate transcription.
- **Structural Gene**: This is the segment of DNA that is transcribed into RNA.
- **Terminator Region**: This is the region where transcription ends.

3. **Role of the Promoter Region**: The transcription process begins at the promoter region. The RNA polymerase enzyme, along with the help of a sigma factor, binds to this region to start synthesizing RNA.

4. **Analyzing the Options**:
- **Option A: Terminator Region**: This is incorrect because transcription stops at the terminator region.
- **Option B: Anywhere on DNA**: This is also incorrect because transcription occurs at specific sites, not randomly.
- **Option C: Intron**: Introns are non-coding regions within the RNA that are spliced out and do not initiate transcription.
- **Option D: Promoter Region**: This is the correct answer as it is the site where transcription begins.

5. **Conclusion**: Therefore, transcription starts at the promoter region of the DNA.

**Final Answer**: Transcription starts at the promoter region.

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