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Nucleotide chains of DNA facilitate replication procedure

How do the two complementary nucleotide chains of DNA facilitate the replication procedure of the molecule?

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

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