NH NH C-CH CH HC HN 0=C CH O=C CH N N H H ADENINE GUANINE THYMINE CYTOSINE Figure 9-3 The four bases of DNA all contain nitrogen. They are shown on colored shapes that will be used throughout the chapter to represent these chemicals FIGURE 9-4. The structural formu. la of an adenine nucleotide shows a molecule of deoxyribose, a phos ADENINE phate group, and adenine. They are PHOSPHATE shown on colored shapes that will be used throughout the chapter te HO-P-O epresent these chemicals DEOXYRIBOSEFigure 9-3 The four bases of DNA all contain nitrogen.They are shown on colored shapes that will be used throughout the chapter to represent these chemicals