What is the full form of $RTase$?

Briefly describe the scheme of $DNA$ replication proposed by Watson and Crick.

If $E. coli$ is grown in a $^{15}N$ medium for $80$ minutes,starting from a $^{14}N$ medium,what will be the ratio of light to hybrid $DNA$ molecules obtained?

$15 \,N$ labeled $Escherichia \,coli$ is allowed to grow in a $14 \,N$ medium. The two strands of the $DNA$ molecule of the first generation bacteria have:

$DNA$ replication is .............

Synthesis of leading and lagging strand require