What Would Happen to the Lac Operon in the Absence

question 5

Multiple Choice

What would happen to the lac operon in the absence of allolactose?

• A) The structural genes within the lac operon will be constitutively transcribed.
• B) The activator protein will be bound to the operator, which will turn on the structural gene behind it.
• C) The repressor regulator protein binds to the operator and prevents the transcription of the structural gene.
• D) The catabolite activator protein becomes inactivated and no transcription occurs.
• E) The cAMP level rises in the absence of allolactose, which in turn inactivates the transcription.

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