The mode of $DNA$ replication in $E. coli$ is:

Which organism was used as experimental material to study $DNA$ replication?

Which of the following is $NOT$ directly involved in the synthesis of a $DNA$ strand?

Taylor and his colleagues proved that $DNA$ in chromosomes also replicates semi-conservatively. Which organism did they use for this experiment?

$E. coli$ bacteria grown in ${}^{15}NH_4Cl$ medium for several generations are allowed to grow in ${}^{14}NH_4Cl$ medium. After $2$ generations,the density gradient of the isolated $DNA$ is:

The process of $DNA$ multiplication is called: