In mice, there are viruses that are known to cause cancer. You have a pure preparation of virus DNA, a pure preparation of DNA from the chromosomes of mouse cancer cells, and pure DNA from chromosomes of normal mouse cells. Virus DNA will specifically anneal with cancer-cell DNA, but not with normal-cell DNA. I then explore the possible genetic significance of this observation, its significance at the molecular level, and its medical significance.
DNA structure as well as viruses and cancer are briefly explained.