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Two objects considered together because of similarity, for a common purpose, or because of some attracting force between them.
Two of anything similar in shape, size, and conformation.
In the double-stranded helical arrangement of DNA, the complementary purine-pyrimidine nucleotide bases (adenine-thymidine or guanine-cytosine) that are linked by weak chemical bonds. The order of these base pairs encode the genetic information in each segment of DNA.
Two particles of opposite charge, usually an electron and a proton.