OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When the strong transcription occur?
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Glucose present, lactose absent
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Glucose present, lactose present
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Glucose absent, lactose absent
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Glucose absent, lactose present
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Explanation:
Detailed explanation-1: -Glucose absent, lac tose present: Strong transcription of the lac operon occurs. The lac repressor is released from the operator because the inducer (allolactose ) is present. cAMP levels are high because glucose is absent, so CAP is active and bound to the DNA.
Detailed explanation-2: -In the absence of lactose, There is no transcription occured by RNA polymerase because The lac repressor binds tightly to the operator only in absence of lactose.
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