complementary base pairing
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complementary base pairingthe arrangement of NUCLEOTIDE BASES so that purines bond with pyrimidines, as occurs in the two polynucleotide chains of DNA (adenine with thymine, guanine with cytosine) and between DNA and MESSENGER RNA nucleotides during TRANSCRIPTION. See Fig. 136.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005