THE MOLECULAR BASIS OF INHERITANCE
GENE MUTATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What does the lactose do to the Operon?
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Blocks transcription because of the energy it provides
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Allows the repressor to be unbind from the Operator.
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The lactose binds the lactose and stops transcription
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Allows for the transcription to speed
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Explanation:
Detailed explanation-1: -When lactose is present, the lac repressor loses its DNA-binding ability. This clears the way for RNA polymerase to bind to the promoter and transcribe the lac operon.
Detailed explanation-2: -Bacterial lac Operon On the addition of lactose, the lacI protein undergoes a conformational change, which changes its binding affinity for the lacO sequences. The lacI protein thereby comes off the lacO sites, and transcription can occur.
Detailed explanation-3: -An inducer (allolactose or an analog) binds to the repressor and prevents its binding to the operator, thereby releasing the repression and allowing transcription of the lac operon.
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