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Question
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 ______.
Options
In the presence of glucose, E.coli cells do not utilize lactose.
They cannot transport lactose from the medium into the cell.
The lac operon is constitutively active in these cells.
They cannot synthesize functional beta galactosidase.
Solution
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.
Explanation:-
E.coli with a mutant z gene in the lac operon is unable to grow in media containing solely lactose as a source of energy because it lacks the ability to generate functional beta-galactosidase, which is required for cell wall building.
