Although glucose stores far more energy, the immediate energy currency used directly for cellular work is
- A. glucose
- B. ATP
- C. glycogen
- D. NADH
Explanation
ATP releases a small, manageable packet of energy when one phosphate is hydrolysed, so it can power single reactions without waste. Glucose must first be respired to recharge ATP, which is why ATP is called the currency and glucose the reserve.
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