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Assertion: The lac operon in bacteria is regulated by both positive and negative control mechanisms.
Reason: In the absence of lactose, the lac operon is negatively regulated by the lac repressor protein, while in the presence of lactose, it is positively regulated by the inducer molecule.
Both the assertion and reason are true, and the reason is a correct explanation of the assertion.
Both the assertion and reason are true, but the reason is not a correct explanation of the assertion.
The assertion is true, but the reason is false.
The assertion is false, but the reason is true.
Answers (1)
The assertion states that the lac operon in bacteria is regulated by both positive and negative control mechanisms, which is true. The lac operon is negatively regulated in the absence of lactose by the lac repressor protein, which prevents transcription. However, in the presence of lactose, the inducer molecule binds to the lac repressor, causing a conformational change and preventing its binding to the operator region. This allows RNA polymerase to bind and initiate transcription, resulting in positive regulation. Therefore, the reason provided is a correct explanation of the assertion. Hence, option 1 is the correct answer.
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