Explain how studying viruses led to the discovery that DNA contains genetic material

See below

Explanation:

Hershey and Chase Experiment:

Viruses, such as T2 Bacteriophage infect by injecting their genetic material into a cell. When Hershey and Chase used radioactive isotopes of sulfur (marking proteins) and phosphorous (marking DNA) and saw which was injected into the cell by the T2 Bacteriophage, sulfur was found outside while phosphorous was found inside the cell. That means that DNA was injected into the cell, not proteins. As the genetic material is injected into the cell to hijack it, and as DNA was injected inside while proteins remained outside, DNA is the genetic material.

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).