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Lac Operon

In , the lac ...

Question

In , the lac operon gets switched on when

A

Repressor binds to operator

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B

Lactose is present and it binds to RNA polymerase

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C

Lactose is present and it binds to the repressor

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D

RNA polymerase binds to the operator

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Solution

The correct option is C
Lactose is present and it binds to the repressor

The lac operon is an operon required for the transport and metabolism of lactose in . With lactose in the cell, lactose binds to the repressor. This causes a structural change in the repressor, and it loses its affinity for the operator by which it is switched on.

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Similar questions

Q. Read the statements regarding the lac operon and choose the correct option
I. An inducer regulates the switching on and off of lac operon.
II.Repressor protein dissociates from operator region and prevents RNA polymerase from transcribing the operon.
III. In the presence of lactose, the repressor is activated by interaction with lactose.
IV. RNA polymerase has access to the promoter and transcription proceeds only when the repressor is inactivated.

Q. Repressor binds to operator of lac operon

Q. During expression of an operon, RNA polymerase binds to

Q. Which of the following statements are true about lac operon?
I. Glucose binds to CAP binding site and activates the operon
II. In the absence of lactose, the repressor binds with the operator region
III. All three structural gene products are not essential for the metabolism of lactose
IV. The operator is a negative regulatory site bound by the lac repressor protein

Q. In the operon model, RNA polymerase binds to

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