NEET 2026 Biology question

Which of the following statements about lac-operon is **correct**?

(1)Gene *i* is constitutively expressedCorrect
(2)Lactose activates repressor to bind to the operator
(3)Genes *i*, *z*, *y* and *a* share single common promoter
(4)Galactose can act as an inducer of lac operon

Answer: (1)

Solution

The regulatory gene i has its own promoter and is expressed constitutively, producing the repressor protein all the time, so (1) is correct. (2) is wrong: the inducer (lactose/allolactose) binds the repressor and inactivates it, so the

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Question ID VK-105139