To MOST Readily Demonstrate Transformation of Bacteria in the Laboratory

Multiple Choice

To MOST readily demonstrate transformation of bacteria in the laboratory one could extract DNA from:

A) an auxotroph and add it to prototrophic cells.
B) arg^- cells and add it to arg⁺ cells.
C) strep^s (sensitive) and add it to strep^r (resistant) cells.
D) arg⁺ cells and add it to arg^- cells.
E) both arg^- and arg⁺ cells, mix them, and select for recombinants.