If the Gene Encoding the Lac Repressor Is Mutated So

question 121

Multiple Choice

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

• A) Yes, because the repressor transcriptionally activates the lac genes.
• B) Yes, but only when lactose is present.
• C) No, because RNA polymerase is needed to transcribe the genes.
• D) Yes, because RNA polymerase will be able to bind the promoter and transcribe the operon.
• E) No, because cAMP levels are low when the repressor is nonfunctional.

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