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 ______.

विकल्प

• 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.

Answer 1

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.