If the DNA of this virus was labeled with 32P and the protein of the virus was labeled with 35S, which molecule(s) would be present inside the cells?
(a) 35S and 32P
(b) 35S only
(c) 32P only
(d) Neither molecule would be present inside the cell
Viruses grown in the presence of radioactive phosphorus contained radioactive DNA but not radioactive protein because DNA contains phosphorus but protein does not.
As DNA is the genetic material that passed from virus to bacteria, bacterial cells will contain radioactive P and not S.