Question

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Explanation:

Step1: Recall ADP/ATP structure

ADP (Adenosine Diphosphate) has 2 phosphate groups ($P$), ATP (Adenosine Triphosphate) has 3 phosphate groups.

Step2: Identify the diagrams

• Top diagram: 2 phosphate groups → ADP.
• Bottom diagram: 3 phosphate groups → ATP.
• Building blocks: Both have adenine (hexagonal - pentagonal structure), ribose (pentagon), and phosphate ($P$). ADP: adenine + ribose + 2 $P$; ATP: adenine + ribose + 3 $P$.
• Energy: ATP has more energy (due to 3rd phosphate bond); ADP has less, gains energy to become ATP, loses energy to become ADP.

Answer:

• ADP: Top diagram (2 phosphate groups: adenine, ribose, 2 $P$).
• ATP: Bottom diagram (3 phosphate groups: adenine, ribose, 3 $P$).
• Compare/Contrast: Both have adenine, ribose; ADP has 2 $P$, ATP has 3 $P$. ATP stores more energy (releases when 3rd $P$ is removed to form ADP).