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Best Answer: That DNA is antiparallel means that the two strands of DNA have opposite chemical polarity, or, stated another way, their sugar-phosphate backbones run in opposite directions.
The two DNA strands are complementary and parallel, but they go in opposite directions. The antiparallel structure of DNA is important in DNA replication because it replicates the leading strand one way and the lagging strand the other way. The antiparallel strands allow for the formation of hydrogen bonds between the nitrogenous bases of DNA. If the strands were not antiparallel these nonsymetrical hydrogen bonding interactions would not be possible. It is important that CG interactions have three H- bonds, and AT have two H-bonds.