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smiledmilk845
The initiation of DNA replication occurs in two steps. First, a so-called initiator protein unwinds a short stretch of the DNA double helix. Then, a protein known as helicase attaches to and breaks apart the hydrogen bonds between the bases on the DNA strands, thereby pulling apart the two strands.
unicornland
DNA replication occurs in the S phase of the cell cycle. During the S phase of the cell cycle, the DNA double helix is unwound by the enzyme helicase and each single helix is duplicated by assembly of nucleotides by DNA polymerase.

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