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Assertion: The Lac operon is an example of negative regulation of gene expression in bacteria.
Reason: In the absence of lactose, the Lac repressor protein binds to the operator, preventing transcription of the genes in the Lac operon
Both assertion and reason are true, and the reason is the correct explanation of the assertion.
Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
Assertion is true, but the reason is false.
Assertion is false, but the reason is true.
Answers (1)
The Lac operon in bacteria is an example of negative regulation of gene expression because the lac repressor protein binds to the operator region of the Lac operon in the absence of lactose, thereby preventing RNA polymerase from binding to the promoter and transcribing the genes. This negative regulation is important for conserving energy and resources because the enzymes required for the metabolism of lactose are only produced when lactose is present. The reason given in the statement is the correct explanation of the assertion because it explains how negative regulation is achieved in the Lac operon. The binding of the lac repressor protein to the operator prevents the transcription of the Lac operon genes, and this binding is dependent on the presence or absence of lactose. Therefore, option 1 is the correct answer.
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