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 low level of transcription occur?
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Glucose present, lactose absent
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Glucose absent, lactose absent
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Glucose present, lactose present
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Glucose absent, lactose present
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Explanation:
Detailed explanation-1: -Glucose present, lac tose present: Low-level transcription of the lac operon occurs. The lac repressor is released from the operator because the inducer (allolactose ) is present.
Detailed explanation-2: -Glucose therefore stops activation of the lac operon (a cluster of coordinately regulated genes involved in lactose catabolism), which prevents lactose use and leads to preferential use of glucose.
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