Question

the diagram summarizes the steps in one round of the krebs cycle. which chemical reaction in the cycle stores extra chemical energy in a molecule by forming a new chemical bond? a. adp + p → atp b. fadh₂ → fad c. nadh → nad⁺ d. pyruvate ion → acetyl - coa+co₂

Explanation:

Step1: Understand energy - storing reactions

Energy is stored when a high - energy bond is formed.

Step2: Analyze each option

• Option A: ADP + P → ATP forms a high - energy phosphate bond in ATP, storing energy.
• Option B: FADH₂ → FAD releases energy as FADH₂ is oxidized.
• Option C: NADH → NAD⁺ releases energy as NADH is oxidized.
• Option D: Pyruvate ion → acetyl - CoA+CO₂ is a catabolic reaction that releases energy.

Answer:

A. ADP + P → ATP