OBJECTIVE LIFE SCIENCE
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the condition that activate CAP?
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cAMP levels are high because glucose is absent
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cAMP levels are low because glucose is absent
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cAMP levels are low because glucose is present
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cAMP levels are high because glucose is 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: -If lactose is absent and glucose is present (see Fig. 16-13A), the gene products from the lac operon are not needed. Thus a regulatory factor, the repressor protein, prevents lac operon expression.
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