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(B) Matthew Meselson and Franklin Stahl performed an experiment in $1958$ to prove that $DNA$ replication is semi-conservative.They grew $E. coli$ in

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Centrifugation

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(B) Matthew Meselson and Franklin Stahl performed an experiment in $1958$ to prove that $DNA$ replication is semi-conservative.They grew $E. coli$ in a medium containing $^{15}N$ (a heavy isotope of nitrogen) for many generations.This resulted in the incorporation of $^{15}N$ into the newly synthesized $DNA$.They then transferred these cells into a medium with normal $^{14}N$ and allowed them to divide.To separate the heavy $^{15}N-DNA$ from the lighter $^{14}N-DNA$,they used $CsCl$ (Cesium Chloride) density gradient centrifugation.This technique separates molecules based on their density,allowing the identification of different $DNA$ strands.

Which method did Meselson and Stahl use to separate $DNA$?

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