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

Give scientific reasons: $DNA$ polymerase plays a dual function during $DNA$ replication.

For providing evidence in favour of semiconservative way of $DNA$ replication, Taylor, Woods, and Hughes performed experiments on:

During replication of a bacterial chromosome,$DNA$ synthesis starts from a replication origin site and:

For how long should bacteria be cultured in a $^{14}N$ medium after being transferred from a $^{15}N$ medium so that the extracted $DNA$ consists of equal amounts of hybrid $DNA$ and light $DNA$?

The semiconservative model of $DNA$ replication in eukaryotes was experimentally demonstrated by which researchers?