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E. colicells with a mutated z gene of th...

E. colicells with a mutated z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because

A

the lac operon is constitutively active in these cells.

B

they cannot synthesise functional beta-galactosidase.

C

in the presence of glucose,E.coli cells do not utilise lactose.

D

they cannot transport lactose from the medium into the cell.

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