Final answer:
Pulling apart long helical strands, such as DNA, during replication is facilitated by helicase and is necessary for the replication machinery to synthesize new DNA.
Step-by-step explanation:
Pulling apart long helical strands, typically referring to DNA replication, facilitates replication. This process is crucial because DNA must be unwound to allow the replication machinery, including enzymes like DNA polymerase, to access the strands and synthesize new DNA. The enzyme helicase is responsible for separating the DNA strands at the origin of replication, while topoisomerase manages the supercoiling stress induced by this unwinding.