The copying of the information in DNA is efficient because the DNA molecule can be copied without disrupting the hydrogen bonds between bases. each strand of a DNA molecule carries complementary information and can be used as a template during replication. the pairing of two DNA strands is antiparallel, and strands are held together via hydrogen bonds. any purine (A or G) can pair with any pyrimidine (T or C). each strand of a DNA molecule can be used as a template during replication because each nitrogenous base pairs with an identical base via hydrogen bonding, e.g. A to A, G to G.

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