why galactose or glucose cannot act as inducer in lac operon???

Lactose act as a inducer because it inactivate the LacI repressor by binding with it. Lactose structure is such that it can bind with the LacI repressor whereas galactose and glucose structures are not efficient for binding with the repressor, that is why they cannot act as a inducer of Lac operon.

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bcz beta-galactosidase enzyme has lactose as its substrate which also acts as inducer for the operon..

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