In Escherichia coli, lac operon is induced by

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5.Molecular Basis of Inheritance

medium

In Escherichia coli, lac operon is induced by

$lactose$

$promotor\; gene$

$b-galactosidase$

$I-gene$

Solution

The inducer for Lac operon of Escherichia coli is lactose (actually allolactose or metabolite of Lactose). This lac operon normally remains inactive. When lac operon contacts with lactose, the lactose acts as an inducer and combines with the repressor, and the repressor is detached from operator gene. Thus $RNA$ – repressor, and the repressor is detached from operator gertural genes and polymerase enzyme gets its passage and reaches to the structural starts the transcription.

Standard 12

Biology