The enzyme that breaks apart the double helix, exposing two template strands, is helicase.

Here's how it works:

* DNA replication: During DNA replication, helicase unwinds the double helix by breaking the hydrogen bonds between the nitrogenous bases. This creates two separate strands, known as the template strands.

* Other processes: Helicase is also involved in other processes like transcription (the process of creating RNA from DNA), DNA repair, and recombination.

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