NEET Biology question

Biology Molecular Basis of Inheritance NEET

Assuming that the level of glucose is low, a mutation occurred in the repressor, associated with the lac operon of E. coli, which prevents the binding of the repressor to the operator. It will results in

(A)Constitutive expression of the lac operon genesCorrect
(B)Lack of expression or reduced expression of the lac operon genes under all circumstances
(C)Expression of the genes only when lactose is present
(D)Expression of the genes only when lactose is absent

Answer: (A)

Solution

If the repressor can no longer bind the operator, it can never block RNA polymerase, so the lac operon genes are

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Question ID VK-120758