What happens when allolactose acts as an inducer in lac operon?

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Allolactose promotes more tighter binding of the repressor to the operator.

Allolactose is a gratuitous inducer and helps in constitutive expression of lac operon.

The allolactose binds to permease and stops uptake of any further allolactose into the cell.

Allolactose induces the expression of structural genes of lac operon

answer is A.

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Detailed Solution

Allolactose, which is an isomer of lactose is the inducer of operon. A few lactose molecules present in the cytoplasm of E.coli are metabolised into allolactose by β-galactosidase. When this inducer binds to the repressor and changes its conformation, the repressor protein cannot bind to the operator.

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