Ten E.coli cells with ${ }^{15} N$ - dsDNA are incubated in medium containing ${ }^{14} N$ nucleotide. After 60 minutes, how many E.coli cells will have DNA totally free from $15\,N$ ?

  • [NEET 2022]
  • A

    $40\,cells$

  • B

    $60\,cells$

  • C

    $80\,cells$

  • D

    $20\,cells$

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