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Base pair. Depiction of the adenine-thymine Watson-Crick base pair. A base pair (bp) is a unit consisting of two nucleobases bound to each other by hydrogen bonds. They form the building blocks of the DNA double helix, and contribute to the folded structure of both DNA and RNA.
What is BASE PAIRING RULE? A rule which states that DNA from any cell should have a 1:1 ratio of pyrimidine and purine bases: amount of guanine should be equal to the amount of cytosine and the amount of adenine should be equal to the amount of thymine. This pattern refers to both strands of the DNA.