DNA doubling is called replication. During replication, special enzymes disconnect the two chains of the original parent DNA molecule, breaking the hydrogen bonds between complementary nucleotides. Molecules of DNA polymerase, the main replication enzyme, bind to open chains. Then the DNA polymerase molecules begin to move along the mother chains, using them as matrices, and synthesize new daughter chains, selecting nucleotides for them according to the principle of complementarity. As a result of replication, two identical double-stranded DNA molecules are formed. Each of them contains one chain of the original parent molecule and one newly synthesized daughter chain.
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