SEARCH Articles Figures Tables Adenine, tautomerism base pair with thymine and uracil Base Pairing in the Purine and Pyrimidine Crystal Structures Base Pairs Can Combine to Form Triplets and Quadruplets Base Pairs, Triplets, and Quartets Base pairing bases Base pairs Base-Pair Configurations with Purine and Pyrimidine Homo-Association Bases Base pair Conjugate acid-base pair Two species related to each other by the donating and Conjugate acid-base pair Two species related to each other by the donating and accepting Conjugate acid-base pair Two species related to each other by the donating and accepting of a single proton Cytosine base pairing and Electron-Pair Donation and the Lewis Acid-Base Definition G:C and A:T base pairs Hydrogen bond DNA base pairs and Metallo-Base Pair in DNA and Its Effect on Thermal Stability The Structure of DNA and RNA Double Helices is Determined by Watson-Crick Base-Pair Geometry Thymine base pairing and Watson-Crick base pairs G«C and