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Lac Operon

The inducer f...

Question

The inducer for switching on the lac operon in bacteria is

A

Presence of lactose

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B

Number of bacteria

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C

Presence of structural genes in the bacteria

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D

Presence of sucrose

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E

Presence of RNA polymerase

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Solution

The correct option is E Presence of lactose
Lactose: Regulatory gene produces a repressor and which goes to bind the inducer to form a repressor-inducer complex. This complex when fails to join the operator gene, results in gene expression of these three genes, metabolizing lactose to galactose and glucose. Hence, lactose acts as an inducer for its breakdown. Thus, the correct answer is option A.

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Similar questions

Q. Explain how structural genes of lac operon start transcription on addition of lactose.

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.

The inducer for switching 'on' the lac operon in bacteria is

Q. Explain the regulation of lac operon in absence and presence of lactose as an inducer.

Q. Glucose or galactose cannot act as inducers for lac operon. Can you think for how long the lac operon would be expressed in the presence of lactose?

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