5. During the late 1940’s, English biophysicists discovered that DNA crystallized when water is removed. This fact suggested that the atoms in DNA must be arranged in a very orderly fashion, perhaps with many repetitions of a fairly simple pattern. [ Finding - ]
6. In 1952, Americans Martha Chase and Alfred Hershey knew that viruses can attack bacterial cells and inject them with virus genetic information. They grew viruses with radioactive phosphorus in the DNA molecules and radioactive sulphur in the protein molecules. After these viruses attacked the bacteria and injected their genetic information, only one radioactive molecule was found inside the bacteria! Watch the animation to find out what they discovered.
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