Multiple choice

If the gene encoding the lac repressor is mutated so that it can no longer bind the operator, will transcription of that operon occur?

  1. Yes, but only when lactose is present

  2. No, because RNA polymerase can transcribe the genes

  3. Yes, because the operator will not be bound by repressor and RNA polymerase can transcribe the lac operon.

  4. No, because cAMP levels are low when the repressor is nonfunctional
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If the lac repressor in non functional, it cannot bind the operator site and transcription of the lac operon will occur at all times, whether or not lactose is present.

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