$DNA$ replication requires:

$E. coli$ 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:

On which template strand of $DNA$ is the new strand synthesized discontinuously?

Okazaki fragments are joined in correct sequence by

Given below are two statements.
Statement $I$ - The template strand with free $3'$ end is called leading template and the strand with free $5'$ end is called lagging template.
Statement $II$ - Replication always starts at the $3'$ end of the template strand and proceeds towards the $5'$ end of the template.
In the light of the above statements,select the correct option given below:

New $DNA$ synthesis occurs in the $P$ direction,and the $DNA$ polymerase enzyme reads the template in the $Q$ direction.
$\quad \quad \quad \quad P \quad \quad \quad \quad \quad Q$