Oswald, McLeod, and McCarty determined the nature of the genetic material by using a similar experimental setup to Griffith's and systematically
destroying DNA, RNA, and protein of the virulent cells. Which finding
describes the results of their experiments?
A. When DNA was destroyed, virulent cells did not transform
nonvirulent cells.
B. When protein was destroyed, virulent cells did not transform
nonvirulent cells.
C. When RNA was destroyed, virulent cells did not transform
nonvirulent cells.
D. Virulent cells always transformed nonvirulent cells.