In $DNA$ strand replication, Okazaki fragments are:

Given below are the two statements.
Statement $I$: In prokaryotes,there is only one replicon,however,in eukaryotes,there are several replicons in tandem.
Statement $II$: The two separated strands in a replicon of $DNA$ are prevented from rejoining by helicase enzyme.
In the light of the above statements,choose the correct answer from the options given below.

Mutagens that are effective in inducing spontaneous $DNA$ mutations are .....

During the polymerization of deoxyribonucleoside triphosphates in bacteria,which of the following enzymes is mainly required?

Which enzyme is responsible for linking the fragments of $DNA$?

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