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E. coli cells with a mutated Z gene of t...

E. coli cells with a mutated Z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because :

A

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

B

They cannot transport lactose from the medium into the cells

C

The lac operon is constitutively active in these cells

D

They cannot synthesize functional galactosidase

Text Solution

Verified by Experts

The correct Answer is:
D
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