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E.Coli cells with a mutated z gene of th...

E.Coli cells with a mutated z gene of the lac operon cannot grow in medium containing only lactose as the source 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 cell

C

The lac operon is constitutively active in these cells

D

They cannot synthesize functional betagalactosidase

Text Solution

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The correct Answer is:
D
The lac Z gene code for enzyme `beta` galactosidase which break down lactose into glucose and galactose. The mutated lac Z gene can not synthesise functional − `beta` galactosidase as a result lactose does not get metabolised as a result it do not get as a primary source of energy glucose as a substrate
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