Is the lac operon transcribed when lactose is present?
a. Yes, lactose binds to the repressor, allowing RNA polymerase to bind to the promoter and transcribe the
operon.
b. Yes, lactose binds to RNA polymerase, allowing it to bind to the promoter and transcribe the operon.
c. No, lactose binds to the repressor, allowing it to bind to the two operators preventing transcription.
d. No, lactose has no effect on transcription of the lac operon.
e. No, lactose binds to the second operator, blocking transcription by RNA polymerase.
ANSWER: a
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