[They cannot synthesize fu...] E. coli cells with a mutated z gene of the lac operon cannot grow in medium containing only lactose

For Competitive Exams

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

They cannot synthesize functional beta galactosidase

They cannot transport lactose from the medium into the cell

The lac operon is constitutively active in these cells

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

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