A $DNA$ molecule in which both strands have radioactive thymidine is allowed to duplicate in an environment containing non-radioactive thymidine. What will be the correct number of $DNA$ molecules that contain some radioactive thymidine after three duplications

  • [AIIMS 1980]
  • A

    There will be four such molecules

  • B

    There will be eight such molecules

  • C

    There will be only one such molecule

  • D

    There will be two such molecules

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  • [AIIMS 2003]

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