Botany-Gene Regulation
NEET Botany Gene Regulation MCQ Question
Type: MCQ-numerical-Medium-Class 12
If the concentration of lactose in the growth medium of E. coli is increased from 0 to 5 mM, which of the following changes is expected in the expression of the lac operon?
A
Increased transcription of the lac operon genes
B
Decreased transcription of the lac operon genes
C
No change in the transcription of the lac operon genes
D
Complete repression of the lac operon genes
Correct Answer
Option A
Detailed Explanation
The NCERT context states that lactose acts as an inducer of the lac operon. When lactose is present, it induces the operon by preventing the repressor from binding to the operator, thus increasing transcription.
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