Question: A mutant ( mutant 1 ) of E . coli is isolated that fails to ferment several sugars, including lactose and arabinose, among others. Addition

A mutant

(

mutant

1)

of E

.

coli is isolated that fails to ferment several sugars, including lactose and arabinose, among others. Addition of cAMP to the medium restores the ability to ferment all sugars. What is the most likely site of the mutation? Why?

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