Which of the following enzymes is used in the multiplication (replication) of $DNA$?

$E. coli$ has $4.6 \times 10^6 \text{ bp}$, its rate of multiplication during replication is about $ . . . . . . $ per second. (in $\text{ bp}$)

$DNA$ replication is

If a normal $DNA$ molecule replicates in an $N^{15}$ medium for consecutive generations,what is the percentage of light $DNA$ in the $4^{th}$ generation (in $\%$)?

On which of the following did Taylor and his colleagues perform their experiments?

Describe the experimental proof for the semi-conservative mode of $DNA$ replication.