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DNA Replication
- First, the DNA helices begin unwinding from the nucleosomes, then a helicase enzyme untwists the double helix and gradually separates the DNA molecule into two nucleotide chains, exposing the nitrogenous bases. The site of separation is called the replication bubble, and the region at each end of the replication bubble is called the replication fork. Then, each nucleotide strand serves as a set of instructions for building a new complementary nucleotide strand from free DNA precursors dissolved in the nucleoplasm.
