An arg- strain of E. coli is transformed with a plasmid carrying the wild-type (arg+) gene. The transformed cells are replica-plated to two minimal medium plates, one supplemented with arginine and one without. The transformed cells would grow on
A) only the plate lacking arginine.
B) only the plate supplemented with arginine.
C) both plates.
D) neither plate.
E) the plate supplemented with arginine only if a mutation occurred.

Question

Quizplus · Accepted Answer

The transformed E. coli cells now carry the plasmid with the wild-type arg+ gene, allowing them to synthesize arginine and grow on both plates, regardless of the presence of supplemental arginine.

An Arg- Strain of E