Final answer:
Decatenation after the replication of circular DNAs prevents supercoiling by resolving interlinked DNA circles, essential for maintaining DNA integrity and ensuring proper cell division. The correct option is A.
Step-by-step explanation:
Decatenation is required after replication of circular DNAs to prevent supercoiling and resolve interlinked DNA circles. During DNA replication, the unwinding of the double helix leads to supercoiling, which, if not managed, can cause breaks in the DNA strands.
Topoisomerase enzymes play a crucial role here by breaking and reforming the phosphate backbone of DNA ahead of the replication fork, relieving the torsional stress and preventing potential damage to the DNA.
In prokaryotes, following replication, the circular chromosomes become concatenated, or interlocked, and they are separated from each other through the action of bacterial topoisomerase IV, which makes necessary cuts and then reseals the chromosomes.
This process of resolving the intertwining of replicated circular DNA is vital for cell division and the maintenance of DNA integrity.