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The true intracellular inducer of the lac operon is:
A{'text': 'Glucose', 'label': 'A'}
B{'text': 'Galactose', 'label': 'B'}
C{'text': 'Lactose itself', 'label': 'C'}
D{'text': 'Allolactose', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'Allolactose', 'label': 'D'}
Allolactose (an isomer of lactose) is the true inducer; it inactivates the lac repressor encoded by i. The z gene encodes beta-galactosidase, which hydrolyses lactose into glucose plus galactose.
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