Which kind of mutation would cause the lac structural genes to be continuously expressed regardless of the presence or absence of lactose? A. A mutation in lacO such that the repressor always binds. B. A mutation in lad such that it can bind lacO in the absence of lactose. C. A mutation in the promoter that prevents sigma factor recognition D. A mutation in adenylyl cyclase such that it is not inhibited by glucose. E. A mutation in lad that prevents binding to lacO

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