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In transcription unit, the promoter sequ...

In transcription unit, the promoter sequence is located

A

Towards 5' end upstream of the structural gene

B

Towards 5' end downstream of the structural gene

C

Towards 3' end upstream of the structural gene

D

Towards 3' end downstream of the coding strand

Text Solution

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Transcription Unit**: A transcription unit consists of three main components: the promoter, the coding sequence, and the terminator sequence. 2. **Identifying the Components**: - **Promoter**: This is the region where RNA polymerase binds to initiate transcription. It is located at the beginning of the transcription unit. - **Coding Sequence**: This is the part of the DNA that is transcribed into RNA and ultimately translated into a protein. - **Terminator**: This signals the end of transcription. 3. **Positioning of the Components**: - The promoter is located at the **5' end** of the transcription unit, which is considered the **upstream** region relative to the coding sequence. - The coding sequence follows the promoter and is located in the middle of the transcription unit. - The terminator is located at the **3' end** of the transcription unit, which is considered the **downstream** region. 4. **Conclusion**: Therefore, the promoter is located at the **5' end of the upstream sequence** of the structural gene (coding sequence). 5. **Final Answer**: The promoter sequence is located at the 5' end of the upstream sequence of the structural gene. ---
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