Question:
In an operon, when repressor protein attaches to the operator then __________ .
In an operon, when repressor protein attaches to the operator then __________ .
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A repressor bound to the operator blocks RNA polymerase.
Updated On: Nov 13, 2026
the operator is switched on.
the structural genes are expressed.
the chemical inducer is synthesized.
the structural genes are not expressed.
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
In an operon, the operator is the switch for the structural genes.
Step 2: Key Point
When the repressor protein binds the operator, RNA polymerase cannot move on to transcribe the genes.
The operon is switched off.
Step 3: Compare the options
So the structural genes are not expressed.
Final Answer:
The structural genes are not expressed. \[ \boxed{\text{(D) }\text{the structural genes are not expressed.}} \]
In an operon, the operator is the switch for the structural genes.
Step 2: Key Point
When the repressor protein binds the operator, RNA polymerase cannot move on to transcribe the genes.
The operon is switched off.
Step 3: Compare the options
So the structural genes are not expressed.
Final Answer:
The structural genes are not expressed. \[ \boxed{\text{(D) }\text{the structural genes are not expressed.}} \]
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