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Which of the following is required as inducer(s) for the expression of $lac$ operon?
A
galactose
B
lactose
C
lactose and galactose
D
glucose
Explanation
Lactose (allolactose) induces the lac operon.
Detailed Solution
The $lac$ operon consists of one regulatory gene and three structural genes needed to metabolise lactose. It is induced by lactose (inducible operon), so lactose is the inducer.