Is the genetic material DNA or Protein?
Isotopes Used:
1. 35S (Sulfur) → Labels Protein
2. 32P (Phosphorus) → Labels DNA
Task: Infect bacteria, separate coats, and find the radiation.
Batch 1 (35S): Radiation stayed in Supernatant (Viral Coats). Batch 2 (32P): Radiation entered Pellet (Bacteria).
Verdict: DNA entered the cell to direct reproduction. DNA is the genetic material.