Mam/Sir could you please explain the process of DNA copying?
Before replication can occur, the length of the DNA double helix about to be copied must be unwound. In addition, the two strands must be separated by breaking the weak hydrogen bonds that link the paired bases. Once the DNA strands have been unwound, they must be held apart to expose the bases so that new nucleotide partners can hydrogen-bond to them.
The enzyme DNA polymerase then moves along the exposed DNA strand, joining newly arrived nucleotides into a new DNA strand that is complementary to the template. Each cell contains a family of more than thirty enzymes to ensure the accurate replication of DNA.