How Does the AraC Regulatory Protein Turn on Transcription in the Presence

question 29

Multiple Choice

How does the AraC regulatory protein turn on transcription in the presence of arabinose?

• A) With the addition of arabinose, AraC no longer dimerizes and will form a large loop by binding to araO and aria, and thus can interact with RNA polymerase to permit transcription.
• B) The dimer will form a large loop by binding to araO and aria, and thus can interact with RNA polymerase to permit transcription.
• C) With the addition, AraC no longer dimerizes and thus can interact with RNA polymerase to permit transcription.
• D) It becomes less flexible, so that a monomer can bind to araI1 and araI2 and interact with RNA polymerase to permit transcription.
• E) It becomes more flexible, so that the dimer can bind to araI1 and araI2 and interact with RNA polymerase to permit transcription.

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