A normal DNA molecule is continuously replicate in \( \mathrm{N}^{15} \) medium than what is the...

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A normal DNA molecule is continuously replicate in \( \mathrm{N}^{15} \) medium than what is the \( \% \) of lighter DNA in \( 4^{\text {th }} \) generation.
(1) \( 12.5 \% \)
(2) \( 25 \% \)
(3) \( 0 \% \)
(4) \( 6 \cdot 25 \% \)
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