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Q.

Lac operon is

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a

Inducible operon

b

Constitutive operon

c

House keeping operon

d

Positive repressible operon

answer is A.

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Detailed Solution

Lac operon is inducible operon because its structural gene expression is promoted by the presence of the substrate Lactose. It shows negative regulation because the product of regulatory gene binds to operator to prevent the transcription of structural genes in the absence of a substrate.
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