Bacteria and viruses have DNA too.
In this interview from 1991, Al Hershey describes the experimental approach used in the famous "blender experiment."
Alfred Hershey and Seymour Benzer at Cold Spring Harbor Laboratory, 1953 Symposium.
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.
1951 Cold Spring Harbor Symposium, (L-R): E. B. Lewis, C. C. Lindegren, Alfred Hershey and Joshua Lederberg.
Relaxing during a break at the 1953 Cold Spring Harbor Symposium on Viruses: (L-R) Raymond Appleyard, George Bowen, Martha Chase, June Dixon.
Martha Epstein Chase.
Alfred Hershey working in the lab, 1960.
Joshua Lederberg worked with bacterial genetics while Alfred Hershey showed that DNA is responsible for the reproduction of new viruses in a cell.
Alfred Hershey receiving the 1969 Nobel Prize in Physiology or Medicine.