ATP's sugar component is a pentose Steps:

• Recall ATP structure: adenosine triphosphate consists of adenine base, ribose sugar, and three phosphate groups.
• Identify the sugar: ribose is a five-carbon (pentose) sugar in ATP.
• Classify the sugar type: pentose refers to monosaccharides with five carbon atoms, matching ribose.
• Eliminate mismatches: ATP synthesis in mitochondria uses this standard ATP structure, unrelated to deoxy modifications.

Why D is correct:

• Ribose in ATP is defined as a pentose sugar (C5H10O5), the five-carbon aldose essential to its nucleoside component.

Why the others are wrong:

• A. Deoxyribose is the modified pentose (lacking 2'-OH) found in DNA, not RNA-derived ATP.
• B. Fructose is a six-carbon ketose sugar in sucrose and glycolysis intermediates.
• C. Glucose is a six-carbon aldose sugar, the primary energy source but not part of ATP.

Final answer: D