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Complementary nucleotide chains of DNA

How two complementary nucleotide chains of DNA facilitate replication process of molecule?

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The fact that DNA molecule is made of two polynucleotide chains whose nitrogen-containing bases form hydrogen bonds eases duplication of molecule. Throughout the DNA replication, binding of two chains is broken and each of them serves as a template for formation of a new nucleotide series along it, with the aid of the enzyme DNA polymerase and obeying the pairing rule C-G, A-T. At the end of the procedure two double helix of DNA are generated, each made of an original template chain and of the new synthesized polynucleotide chain.

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