5. In the absence of glucose, E. coli can proliferate using the pento.docx

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5. In the absence of glucose, E. coli can proliferate using the pentose sugar arabinose. The ability of E. coli to utilize the sugar arabinose is regulated via the arabinose operon, depicted in the figure below. The araA, arab, and araD genes encode enzymes for the metabolism of arabinose. The arac gene encodes a gene regulatory protein that binds adjacent to the promoter of the arabinose operon. To understand the regulatory properties of the Arac protein, you engineer a mutant bacterium in which the arac gene has been deleted and look at the effect of the presence or absence of the Ara protein on the AraA enzyme. ara promoter ara operon HaraCarabaraAaraD RNA polymerase binding site a. If the
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