Name a few enzymes involved in $DNA$ replication other than $DNA$ polymerase and ligase. Name the key functions for each of them.

(N/A) $(i)$ Helicase: Unwinds the $DNA$ double helix by breaking hydrogen bonds between base pairs.
$(ii)$ Topoisomerase ($DNA$ Gyrase): Relieves the torsional strain (supercoiling) generated ahead of the replication fork.
$(iii)$ Primase: Synthesizes short $RNA$ primers that provide a $3'-OH$ group for $DNA$ polymerase to initiate synthesis.
$(iv)$ Telomerase: Adds repetitive nucleotide sequences to the ends of chromosomes (telomeres) to prevent their degradation during replication.