In the medium where E . coli was growing, lactose was added, which induced the Iac operon. Then, why does lac operon shut down some time after addition of lactose in the medium?

Question

In the medium where E . coli was growing, lactose was added, which induced the Iac operon. Then, why does lac operon shut down some time after addition of lactose in the medium?,

MARKS App · Accepted Answer

Lac operon is switched on adding lactose in the medium, as lactose acts as inducer and make repressor inactive. Due to this switch on of lac operon system, β -galactosidase is formed which converts lactose into glucose and galactose. As soon as lactose is consumed, repressor again become active and cause switch off(shut down) of system.

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