In the Presence of Isopropylthiogalactoside (IPTG) and Glucose, Transcription of the Lac

question 40

Multiple Choice

In the presence of isopropylthiogalactoside (IPTG) and glucose, transcription of the lac operon

• A) will be at maximal levels because IPTG is a nonmetabolizable inducer.
• B) will be slightly above basal levels due to IPTG causing the release of repressor from the operator site but the presence of glucose prevents maximal induction.
• C) will be at basal levels because the induction of the lac operon requires the presence of lactose.
• D) will terminate as IPTG is an inhibitor of
• E) coli RNA polymerase.

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