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Answer by Surfbanana. Confidence votes 22. Helicase and RNA polymerase separate DNA strands by breaking the hydrogen bonds between complementary bases. Helicase parts the strands of DNA during DNA replication, and RNA polymerase parts them during transcription. The enzyme that separates DNA in called DNA helicases. There are two of them that work away from the origin of replication, creating in bubble in the DNA molecule.
DNA Replication. Before a cell can divide, it must duplicate all its DNA. In eukaryotes, this occurs during S phase of the cell cycle. The Biochemical Reactions. DNA replication begins with the unzipping of the parent molecule as the hydrogen bonds between the base pairs are broken. Once exposed, the sequence of bases on each of the separated strands serves as a template to guide the insertion of a complementary set of bases on the strand being synthesized.