Question

I need this answered!! NOW!! THIS IS URGENT!!!!!!!!

Answer 1

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.

Answer 2

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.