Which of the following molecules is most similar in structure to ATP?

• A. ADP
• B. FAD
• C. GTP
• D. NADH

Answer: (C)

Verified step by step guidance

1. Understand the structure of ATP (adenosine triphosphate). ATP consists of an adenine base, a ribose sugar, and three phosphate groups.
2. Compare ATP with ADP (adenosine diphosphate). ADP is similar to ATP but has two phosphate groups instead of three.
3. Examine the structure of FAD (flavin adenine dinucleotide). FAD is a different molecule with a flavin group and does not have a ribose sugar or phosphate groups like ATP.
4. Look at NADH (nicotinamide adenine dinucleotide). NADH contains a nicotinamide group and does not have the same phosphate group structure as ATP.
5. Consider GTP (guanosine triphosphate). GTP is structurally similar to ATP, as it also contains a ribose sugar, a guanine base instead of adenine, and three phosphate groups.