Bacteria and viruses have DNA too.
Alfred Hershey receiving the 1969 Nobel Prize in Physiology or Medicine.
Alfred Hershey and his son, Peter, at the Nobel Prize ceremonies.
Alfred Hershey and Martha Chase at Cold Spring Harbor, 1953.
Alfred Hershey and Seymour Benzer at Cold Spring Harbor Laboratory, 1953 Symposium.
1951 Cold Spring Harbor Symposium, (L-R): E. B. Lewis, C. C. Lindegren, Alfred Hershey and Joshua Lederberg.
Alfred Hershey was a phage geneticist who, with his research assistant, Martha Chase, did one of the most famous experiments in molecular biology. The "blender" experiment proved that DNA carried genetic information.
Bacterial conjugation and bacteriophages provide proof that a gene is made of DNA.
In this interview from 1991, Al Hershey describes the experimental approach used in the famous "blender experiment."
Joshua Lederberg worked with bacterial genetics while Alfred Hershey showed that DNA is responsible for the reproduction of new viruses in a cell.