STANDARDZoology-Genetics
STANDARD Zoology Gene Expression MCQ Question
Type: MCQ-conceptual-Medium
In E. Coli the lac operon get switched on when ________
A
lactose is present, it releases from repressor
B
Lactose is absent
C
lactose is present, it binds to repressor
D
lactose is present & it binds to RNA polymerase
Correct Answer
Option C
Detailed Explanation
The lac operon is switched on when lactose is present and binds to the repressor, preventing it from binding to the operator region. This allows RNA polymerase to transcribe the operon.
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