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Two objects considered together because of similarity, for a common purpose, or because of some attracting force between them.
1. a combination of two related, similar, or identical entities or objects.
2. in cardiology, two successive premature beats, particularly two ventricular premature complexes.
base pair either of the two pairs—guanine and cytosine, adenine and thymine —of purine-pyrimidine bases joined by hydrogen bonds that make up DNA.
1 two corresponding items similar in form and function.
2 one object composed of two joined interdependent parts. See also base pair.
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.