If Escherichia coli is cultured in broth containing both glucose and lactose, it

A. uses lactose preferentially until the supply is exhausted, then uses glucose.
B. uses glucose preferentially until the supply is exhausted, then uses lactose.
C. uses only the glucose (it cannot use lactose as a source of carbon).
D. uses glucose and lactose simultaneously.


Answer: B

Biology & Microbiology

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