Semiconservative replication of $DNA$ was first demonstrated in
Escherichia coli
Streptococcus pneumoniae
Salmonella typhimurium
Drosophila melanogaster.
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
$DNA$ 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