DNA Replication is the duplication of all of a cells genetic material. The double-stranded DNA is ”un-zipped’ by an enzyme that exists in the cell nucleus called DNA helicase. The helicase breaks the chemical bonds between the nucleotides and the two complementary strands are separated, both these strands act as a "template" for replication. These strands are then duplicated nucleotide for nucleotide by another enzyme, DNA polymerase. The polymerase binds to the template and chemically attaches nucleotides to it in order to create a new complimentary strand to form an identicle copy of the original DNA molecule. As each template strand now has a new complimentary DNA strand attached to it the cell contains two copies of the DNA. 

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