Hershey–Chase experiment - Wikipedia
https://en.wikipedia.org/wiki/Hershey%E2%80%93Chase_experiment
While DNA had been known to biologists since 1869, many scientists still assumed at the time that proteins carried the information for inheritance because DNA appeared to be an inert molecule, and, since it is located in the nucleus, its role was considered to be phosphorus storage. In their experiments, Hershey and Chase showed that when bacteriophages, which …
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