The Meselson Stahl Experiment:  What is the mode of DNA replication?

• The Meselson-Stahl experiment
  • Showed that DNA is replicated semi-conservatively

• Key to Meselson-Stahl experiment
  • DNA containing "heavy nitrogen" (15N) can be distinguished form DNA containing "light nitrogen" (14N) by CsCl density-gradient centrifugation.