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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 synthesize functional Beta galactosidase

C

In the presence of glucose, E. coli do not utilize lactose

D

They cannot transport lactose from the medium into the cell

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The correct Answer is:
B
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