NEET Solved Paper 2016 Question 17

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

Options:

A) Glucose

B) Galactose

C) Lactose

D) Lactose and galactose

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Answer:

Correct Answer: C

Solution:

  • Lactose acts as the inducer for the expression of the Lac operon. When lactose is present, it binds to the repressor protein, causing a conformational change that releases the repressor from the operator region of the operon. This allows RNA polymerase to transcribe the genes necessary for the metabolism of lactose.