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Questions  >>  JEEMAIN and NEET  >>  NEET PAST PAPERS  >>  2005

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 ) They cannot synthesize functional beta galactosidase
( B ) The lac operon is constitutively active in these cells
( C ) They cannot transport lactose from the medium into the cell
( D ) In the presence of glucose, E. coli cells do not utilize lactose

1 Answer

Option is d ,answer
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