Which one of the following accurately describes the Lac operon? A. RNA polymerase is prevented from transcribing the lac genes when lactose is present. B. The repressor protein binds to the operator when lactose is present. C. The repressor is freed from the operator when lactose is present. D. RNA polymerase transcribes the lac genes when lactose isn't present
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Step 1: In the Lac operon system, the repressor protein normally binds to the operator, preventing RNA polymerase from transcribing the lac genes. Show more…
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When the lac-operon is ON: A. Lactose is not present. B. The genes are transcribed. C. The repressor protein is inactive. D. RNA Polymerase can bind the promoter. E. All except A.
Sri K.
Which of the following statements describes prokaryotic transcription of the lac operon? a. When lactose and glucose are present in the medium, transcription of the lac operon is induced. b. When lactose is present but glucose is absent, the lac operon is repressed. c. Lactose acts as an inducer of the lac operon when glucose is absent. d. Lactose acts as an inducer of the lac operon when glucose is present.
Which of the following statements about the lac operon is not true? a. When the inducer binds to the repressor, the repressor can no longer bind to the operator b. When the inducer binds to the operator, transcription is stimulated. c. When the repressor binds to the operator, transcription is inhibited. d. When the inducer binds to the repressor, the shape of the repressor is changed. e. The repressor has binding sites for both DNA and the inducer
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