Q155 / 180 · NEET 2016 (Phase 1) · Zoology

Which of the following is required as inducer(s) for the expression of Lac operon?

A
Glucose
B
Galactose
Correct answer
C
Lactose
D
Lactose and galactose

Solution

Lac operon becomes active only after inducing lactose as it is a substrate for the enzyme beta-galactosidase and it also regulates the switching on and off of the operon which cannot be done by glucose and galactose.

Hence, the correct answer is option: 'C'.

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