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In Lac operon this lies upstream to the ...

In Lac operon this lies upstream to the operator region

A

Inducer

B

Structural gene

C

Promoter region

D

Regulator gene

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The correct Answer is:
To answer the question regarding what lies upstream to the operator region in the lac operon, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Lac Operon Structure**: - The lac operon consists of several key components: the promoter, operator, structural genes, and regulatory genes. 2. **Identifying the Components**: - The **promoter** is the region where RNA polymerase binds to initiate transcription. - The **operator** is the segment of DNA that the repressor protein binds to, blocking RNA polymerase from transcribing the structural genes. 3. **Locating the Upstream Region**: - In molecular biology, "upstream" refers to the direction towards the 5' end of the DNA strand relative to the transcription start site. - The promoter is located upstream of the operator in the lac operon. 4. **Conclusion**: - Since the promoter is the region that lies upstream of the operator, the correct answer to the question is the **promoter region**. ### Final Answer: The region that lies upstream to the operator in the lac operon is the **promoter region**. ---
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