PLEASE FILL OUT THE WHOLE TABLE, THANKS! Part C Regulation of the ara operon Now

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PLEASE FILL OUT THE WHOLE TABLE, THANKS!

Part C Regulation of the ara operon Now you'll examine an operon that undergoes negative and positive control. The ara operon in E. coli codes for enzymes that metabolize the sugar arabinose, which E. coli can use for energy. As you can see in the diagram, the regulatory protein Arac can act as both an activator and a repressor of the ara operon. (a) Arac protein is an activator TRANSCRIPTION Initiator dimer Arabinose RNA polymerase (b) Arac protein is a repressor Initiator P araB araD Arac dimer Poe operator arac o Pearson Education, Inc.

Explanation / Answer

AraC binds to AraC acts as Does transcription occur Does arabinose metabolism occur In the presence of arabinose initiator activator yes yes In the absence of arabinose initiator and operator repressor no no If a mutation prevents arabinose from binding to AraC initiator and operator repressor no no If arabinose is present but a mutation in araD enzyme renders it non-functional initiator activator yes no

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