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Proteins is NOT the Genetic Material... (Hershey and Chase, 1952) A bacteriophage (or, phage) is a type of virus that only infects bacteria. They have a protein coat and a piece of DNA inside. They adhere to the surface of the bacteria and inject their DNA into the bacteria. Their DNA codes for the assembly of more phages after their DNA is incorporated into the bacterial chromosome. Hershey and Chase Experiments 35 S-labelled phages (radioactivity incorporated into the protein of phage only, which contains S) infected bacteria are not radioactive (no 35S) 32 P-labelled phages (radioactivity incorporated into the DNA of phage only, which contains P) infected bacteria are radioactive (contain 32P) Conclusion: Viral DNA is transferred to the bacteria from the virus (phage), which results in the production of more viruses. DNA is the code, or genetic material, for the virus.