ATP is composed of which components?

• A. Adenine, ribose, 4 phosphate groups
• B. Adenine, deoxyribose, 3 phosphate groups
• C. Adenine, ribose, 2 phosphate groups
• D. Adenine, 5 carbon sugar ribose, 3 phosphate groups

Answer: (D)

ATP is a nucleotide called adenosine triphosphate, built from adenine, the five‑carbon ribose sugar, and three phosphate groups. The three phosphate groups form high‑energy bonds, so when one is cleaved during cellular work, energy is released to power processes in the cell. This structure uses ribose (not deoxyribose, which is found in DNA), and it has three phosphates (not four or two), which is why the correct description is adenine, ribose, and three phosphate groups.