Control of the lac operon and lactose utilization in bacteria is (check all that apply)

A. controlled by the expression of three downstream genes.
B. not induced in the presence of both glucose and lactose.
C. only induced when there is glucose but not lactose.
D. preferentially utilizing lactose as a carbon source.
E. is a negative control, mediated by a repressor.


Answer: E

Biology & Microbiology

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