Answer to Question #104874 in Molecular Biology for Kylie

Question #104874
If glucose is absent, but so is lactose, the lac operon will be ________.
1. activated
2. repressed
3. activated, but only partially
4. mutated
1
Expert's answer
2020-03-12T08:43:27-0400

Repressed

No transcription of the lac operon occurs. cAMP levels are high because glucose levels are low, so CAP is active and will be bound to the DNA. However, the lacrepressor will also be bound to the operator (due to the absence of allolactose), acting as a roadblock to RNA polymerase and preventing transcription.


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