How scientists proved DNA copies itself by tracking heavy atoms
In short: The Meselson-Stahl experiment solved a fundamental mystery of biology: how does genetic information replicate without being lost or destroyed? This video explains the elegant method used to confirm that DNA follows a semi-conservative model.
To determine how DNA replicates, researchers Paul Meselson and Franklin Stahl grew E. coli bacteria in a medium containing heavy nitrogen (N-15). After several generations, they transferred the bacteria to a medium with regular nitrogen (N-14) and observed the resulting DNA.
The experiment proved that DNA copies itself through a semi-conservative process, where each new double helix contains one original strand and one newly synthesized strand. This discovery provided a clear mechanism for how genetic material is preserved across generations.
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- Summary by Intellect · source: Meselson-Stahl Experiment
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