Single Choice

Gene regulation governing lactose operon of E.coli that involves the lac I gene product is

ANegative and repressible because repressor protein prevents transcription
BFeedback inhibition because excess of $$\displaystyle \beta $$-galactosidase can switch off transcription
CPositive and inducible because it can be induced by lactose
DNegative and inducible because repressor protein prevents transcription
Correct Answer

Solution

In negative inducible operons, a regulatory repressor protein is normally bound to the operator, which prevents the transcription of the genes in the operon. If an inducer molecule is present, it binds to the repressor and changes its conformation so that it is unable to bind to the operator. This allows for expression of the operon. The lac operon is a negatively controlled inducible operon, where the inducer molecule is allolactose.

SIMILAR QUESTIONS

Genetics

Which of the following is required as inducer(s) for the expression of Lac operon?

Genetics

All of the following are part of an operon except

Genetics

In the lac operon model, lactose molecules function as

Genetics

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

Genetics

Choose the correct answer from the alternatives given : The sequence of structural genes in lac operon is

Genetics

Choose the correct answer from the alternatives given : In E. Coli, the lac operon gets switched on when

Genetics

Choose the correct answer from the alternatives given : In E. Coli, the lac operon gets switched on when

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