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In their semiconservative experiment Mes...

In their semiconservative experiment Meselson and Stahl used

A

`""^(14)C `

B

`""^(32)P`

C

`""^(15)N`

D

`""^(35)S`

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding the Experiment**: Meselson and Stahl conducted an experiment to demonstrate the semi-conservative nature of DNA replication. This means that when DNA replicates, each new DNA molecule consists of one old strand and one newly synthesized strand. 2. **Centrifugation Method**: They used a technique called density gradient centrifugation to separate DNA based on its density. This method allows for the separation of different DNA molecules that have varying densities. 3. **Use of Isotopes**: In their experiment, Meselson and Stahl cultured bacteria in a medium containing a heavy isotope of nitrogen, specifically Nitrogen-15 (N15). This heavy isotope was incorporated into the DNA of the bacteria. 4. **Heavy Density of DNA**: Because the DNA synthesized in the presence of N15 had a heavier density compared to normal DNA (which contains the lighter isotope Nitrogen-14), it allowed for the differentiation of DNA strands during centrifugation. 5. **Conclusion**: After several rounds of replication, the DNA was analyzed, and the results confirmed that the DNA replication was semi-conservative. The correct answer to the question is that Meselson and Stahl used Nitrogen-15 in their experiment. **Final Answer**: In their semi-conservative experiment, Meselson and Stahl used Nitrogen-15 (N15). ---
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