E.coli cells with a mutated $Z$ gene of the lac operon cannot grow in medium containing only lactose as the source energy because
E.coli cells with a mutated $Z$ gene of the lac operon cannot grow in medium containing only lactose as the source energy because
- [AIPMT 2005]
- 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
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- [AIIMS 1985]