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  • In E.coli, the lac operon gets switched on when: a. lactose is present, and it binds to the repressor b. repressor binds to operator c. RNA polymerase binds to the operator d. lactose is present, and it binds to RNA polymerase

In E.coli, the lac operon gets switched on when:

a. lactose is present, and it binds to the repressor

b. repressor binds to operator

c. RNA polymerase binds to the operator

d. lactose is present, and it binds to RNA polymerase

Answers (1)

Lac operon switches on in the presence of an inducer like allolactose or lactose in the following way:

  • Lactose binds to the repressor and prevents it from binding to the operator.
  • This in turn makes RNA polymerase free to bind to the promoter and transcribe the structural genes of the lac operon.

Hence, the answer is an option (a) 

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infoexpert21

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