The inducer for switching 'on' the lac operon in bacteria is

Presence of sucrose

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Presence of structural genes in the bacteria

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Number of bacteria

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Presence of lactose

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Solution

The correct option is D
Presence of lactose

There are two types of operons - inducible operons and repressible operons.

The inducible operon is switched on when an inducer is present. When lactose is added to an culture, the structural genes produce mRNA which synthesises specific polypeptides on the ribosomes.

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