A. radioactive sulfur to label proteins, the genetic material in viruses
B. using radioactive sulfur to label DNA, the genetic material in viruses
C. radioactive phosphorous to label proteins, the genetic material in viruses
D. radioactive phosphorous to label DNA, the genetic material in viruses
B. using radioactive sulfur to label DNA, the genetic material in viruses
C. radioactive phosphorous to label proteins, the genetic material in viruses
D. radioactive phosphorous to label DNA, the genetic material in viruses