How Is Lac Operon Transcription Regulated by the Presence or Absence

question 58

Multiple Choice

How is lac operon transcription regulated by the presence or absence of lactose?

• A) When lactose is available, the repressor will bind to allolactose instead of blocking RNA polymerase by binding to the operator.
• B) When lactose is not available, the repressor will bind to the promoter and block RNA polymerase from binding to the promoter.
• C) When lactose is not available, the repressor will bind to allolactose.
• D) When lactose is available, allolactose is produced and binds to the operator, blocking RNA polymerase.
• E) In the absence of lactose, transcription occurs at a low level, resulting in the production of allolactose, which, in turn, stimulates the cell to take up lactose.

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