Solution:
Various enzymes are required as catalysts during DNA replication in living cells.
✓ DNA-dependent DNA-polymerase - It catalyzes the polymerization of deoxynucleotides on DNA template.
✓ Helicase -It unwinds the DNA strand to form the replication fork.
✓ DNA ligase -It joins the Okazaki fragments which are found on the lagging strand.