Semi­conservative replication of $DNA$ was first demonstrated in

  • [AIPMT 2009]
  • A

    Escherichia coli

  • B

    Streptococcus pneumoniae

  • C

    Salmonella typhimurium

  • D

    Drosophila melanogaster.

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  • [NEET 2022]

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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]

In Meselson and Stahl's experiments, heavy $DNA$ was distinguished from normal $DNA$ by centrifugation in