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(Solved): 3. 20 credits. Meselson and Stahl grew E. coli in medium containing radioactive, heavy ...
3. 20 credits. Meselson and Stahl grew E. coli in medium containing radioactive, “heavy” 15N for many generations, then switched the medium to non-radioactive, “light” 14N. They proceeded two rounds, and even more using density gradient centrifugation, to prove their results. Explain the proof, how were they able to reach their experimental conclusions.
Expert Answer
Method : Meselson and Stahl grew E. coli in a medium containing 15N(15N is the heavy isotope of nitrogen) as the only nitrogen source for many generations. The result was that 15N was incorporated into newly synthesised DNA.Then they transfer