Botany-Gene Regulation
NEET Botany Gene Regulation MCQ Question
Type: MCQ-conceptual-Easy-Class 12
If in a culture of E. coli, the concentration of glucose is decreased and lactose is added, how does the presence of lactose affect the lac operon?
A
Lactose acts as an inducer, deactivating the repressor protein.
B
Lactose acts as a repressor, preventing operon activation.
C
Lactose increases the production of glucose directly.
D
Lactose binds to RNA polymerase to enhance transcription.
Correct Answer
Option A
Detailed Explanation
Lactose acts as an inducer by deactivating the repressor protein bound to the operator region, allowing RNA polymerase to transcribe the lac operon genes.
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