The experiment conducted by Meselson and Stahl using heavy \( \mathrm{N}^{15} \) to prove semi-c...

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The experiment conducted by Meselson and Stahl using heavy \( \mathrm{N}^{15} \) to prove semi-conservative nature of the first generation was found to have
(a) \( \mathrm{N}^{14} \) only
(b) \( \mathrm{N}^{15} \) only
(c) \( \mathrm{N}^{14} \) and \( \mathrm{N}^{15} \)
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