The fact that some viruses use DNA to direct their heredity was demonstrated by
(A) Finding radioactive sulfur from a bacteriophage in a bacterium.
(B) Finding radioactive phosphorus from a bacterium in a bacteriophage.
(C) Finding that radioactive phosphorus from a bacteriophage had mutated in bacterium.
(D) Finding radioactive phosphorus from a bacteriophage in a bacterium.
(E) Finding radioactive sulfur from a bacterium in a bacteriophage.
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