The replication machinery must be able to open and stabilize the template DNA and it must have access to both template strands for replication. Option B.
Replication is very rapid because multiple polymerases can synthesize two new strands simultaneously, using each unwound strand of the original DNA duplex as a template. Replication is initiated by a virus-encoded protein that binds to the origin and also functions as a helicase.
A single-stranded DNA binding protein is required to stabilize the unwound template and the DNA polymerase-α-primase complex initiates DNA synthesis. The replication machinery, the replisome complex consists of a number of specialized proteins that function to support replication by DNA polymerases.
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