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Answer: 3. Bacterium

Meselson and Stahl showed semiconservative replication in 1958 using E. coli.

They grew the bacteria in \(^{15}\)N medium, shifted them to \(^{14}\)N and separated DNA by CsCl density gradient centrifugation. E. coli is a bacterium.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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