Which of the following is required as an inducer(s) for the expression of lac operon?
galactose
lactose
lactose and galactose
glucose
lactose is the substrate for the enzyme beta-galactosidase and it regulates the switching on and off of the operon. Hence, it is termed as the inducer. The text explicitly notes that glucose or galactose cannot act as inducers for the lac operon.
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