In the Hershey-Chase experiments, how was it determined that DNA is the genetic material of viruses?

• A. By observing that proteins were not transferred to the next generation of viruses.
• B. By showing that DNA was more stable than protein in viral replication.
• C. By using radioactive labeling to track DNA and protein, showing only DNA entered the bacterial cells.
• D. By demonstrating that viral proteins could not replicate without DNA.

Answer: (C)