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Which of the following is responsible for the switching on and off of the lac operon?

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in Biology – Class 12 by (271k points)
Which of the following is responsible for the switching on and off of the lac operon?

(a) Lactose

(b) Ethanol

(c) Malate

(d) Fructose

I had been asked this question during an internship interview.

Asked question is from Molecular Basis of Inheritance topic in section Molecular Basis of Inheritance of Biology – Class 12

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The correct option is (a) Lactose

For explanation I would say: The substrate for the enzyme β-galactosidase is lactose. The lac operon can either be in its switched on or off position. This operation is being regulated by lactose which is also known as the inducer.

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