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Nucleotide base pairing in DNA is universal across organisms. Each pair (T−A; C−G) consists of a purine and a pyrimidine. Which of the following best explains how the base pairs form?A. Ionic bonds join two double-ringed structures in each pair.B. Hydrogen bonds join two single-ringed structures in each pair.C. Hydrogen bonds join a double-ringed structure to a single-ringed structure in each pair.D. Covalent bonds join a double-ringed structure to a single-ringed structure in each pair.

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