Answer:
The whole DNA does not open in one stretch due to very high energy requirement, so the replication occurs within a small opening of the DNA helix, which gives the appearance of a Y-shaped structure known as replication fork. DNA replication requires a set of different enzymes which are as follows (i) DNA helicase It helps to unwind the DNA strand for the formation of a replication fork. (ii) DNA dependent DNA polymerase This enzyme uses a DNA template (parental strands) to catalyse the polymerisation of deoxyribonucleotides. (iii) DNA ligase It facilitates the joining of discontinuously synthesised DNA fragments known as Okazaki fragments.
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