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

In Meselson and Stahl's experiments,heavy $DNA$ was distinguished from normal $DNA$ by centrifugation in

$E. coli$ cells were allowed to replicate in a medium containing radioactive thymidine for $5$ minutes and then transferred to a normal medium for further replication. Which of the following observations will be correct?

Which of the following enzymes is responsible for the synthesis of $DNA$ from $RNA$?

In $DNA$ replication,in which direction does the synthesis of the new strand occur?

Which enzyme is responsible for removing the $RNA$ primer during $DNA$ replication?