Nh I

Thymine

Figure 1 (A) Schematic representation of part of a DNA strand showing the structural formulas of the four constituent bases, adenine, guanine, cytosine, and thymine, linked via the 3'-OH group of the deoxyribose moiety to the 5'-phosphate group of the next nucleotide. Also shown is the numbering of the atoms in the deoxyribose, as well as the pyrimidine and purine rings. The latter consist of a six-membered pyrimidine ring fused to a five-membered imidazole ring. (B) Structural formula of ATP indicating that the ribose, as distinct from deoxyribose, has an OH group at the 2' position on the pentose ring.

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