NEET2015Botany-Molecular Basis of Inheritance
NEET 2015 Botany Gene Expression MCQ Question
Type: MCQ-conceptual-Hard-Class 12
Gene regulation governing lactose operon of E. coli that involves the lac I gene product is
A
positive and inducible because it can be induced by lactose.
B
negative and inducible because repressor protein prevents transcription.
C
negative and repressible because repressor protein prevents transcription.
D
feedback inhibition because excess of β-galactosidase can switch off transcription.
Correct Answer
Option A
Detailed Explanation
The lac operon is negatively regulated by the lac repressor, which binds to the operator to prevent transcription.
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