7. Choose the true statement about activation of transcription from lac operon in the presence of the inducer, allolactose. A. RNA Polymerase is bound to the operator, preventing transcription from the lac operon. B. Inducer binds to the lac Repressor preventing it from binding to the operator C. Inducer binds to the lac Repressor allowing it to bind to the operator D. Repressor is removed from the promoter by the action of RNA polymerase
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(two marks) Which of the following is true with respect to the lac operon? a. The repressor only binds to the operator when it is bound to the product of the enzymes coded for by the genes of the operon. b. The repressor only binds to the operator when it is bound to the mRNA transcript of the lacZ and lacY genes. c. The repressor only leaves the operator when it is bound to the protein product of the lacI gene. d. The repressor is always bound to the operator, but changes shape when lactose binds to it, allowing RNA polymerase to pass. e. The repressor is bound to the operator, except when it is bound to the inducer.
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In the lac operon, the repressor inhibits transcription when a. the repressor is bound to the inducer. b. the repressor is not bound to the inducer. c. the repressor is bound to glucose. d. the repressor is not bound to the operator.
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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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