Question:
In lactose operon of E. coli, what is the function of promoter?
In lactose operon of E. coli, what is the function of promoter?
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The promoter is the site where the transcribing enzyme attaches.
Updated On: Nov 12, 2026
- Binding of Gyrase enzyme
- Binding of RNA polymerase
- Codes for RNA polymerase
- Processing of mRNA
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
The lac operon contains a regulator gene (i), a promoter (p), an operator (o) and structural genes z, y and a.
Step 2: Role of the promoter
The promoter is a DNA sequence where RNA polymerase binds to start transcription of the structural genes.
Step 3: Compare
The promoter itself does not code for any protein, and it has nothing to do with gyrase or with mRNA processing.
Final Answer:
The promoter is the binding site for RNA polymerase. \[ \boxed{\text{(B) }\text{Binding of RNA polymerase}} \]
The lac operon contains a regulator gene (i), a promoter (p), an operator (o) and structural genes z, y and a.
Step 2: Role of the promoter
The promoter is a DNA sequence where RNA polymerase binds to start transcription of the structural genes.
Step 3: Compare
The promoter itself does not code for any protein, and it has nothing to do with gyrase or with mRNA processing.
Final Answer:
The promoter is the binding site for RNA polymerase. \[ \boxed{\text{(B) }\text{Binding of RNA polymerase}} \]
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