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The pair of nitrogenous bases that connects the complementary strands of DNA or of double-stranded RNA and consists of a purine linked by hydrogen bonds to a pyrimidine: adenine-thymine and guanine-cytosine in DNA, and adenine-uracil and guanine-cytosine in RNA.
Purines bases are ADENINE(A) and GUANINE(G), and pirimidines bases are CITOSINE(C) and TIMINE(T).
In DNA, with ADENINE complementary base is TIMINE, and with GUANINE complementary base is CITOSINE.