First, the enzymes know as helicases unwind the double helix by breaking down the hydrogen bonds. Then, the enzyme DNA polymerase controls elongation, the process of unwinding and replicating. During that process, the fragments are removed so that enzymes can stitch together into an elongating strand. Now that two new double helices have replaced the original helix, enzymes now snip off the telomere at the end of each replication. The enzymes called nucleases remove mispaired bases and the DNA polymerase fills in the gaps and that ends the DNA replication process.
