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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Self replication is occurred in

Bacteria were grown in a medium containing heavy isotope of nitrogen ($N^{15}$) for many generations and all their $DNA$ contained many heavy nitrogen only. A bacterium of this type was transferred to normal medium and allowed to duplicate. After two divisions of heavy $DNA$ is likely to be that

  • [AIPMT 1993]

$DNA$ polymerase helps in

During $DNA$ replication which of the following does not act as substrates?

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]