Home Biology Molecular Basis of Inheritance Gene Regulation Expression E. coli cells, with a mutated z gene of the …
Biology Molecular Basis of Inheritance Gene Regulation Expression Single Correct MCQ
Published on: August 13, 2026

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

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