Although glucose stores far more energy, the immediate energy currency used directly for cellular work is
Correct answer: B. ATP
- 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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About Cellular Respiration
Cellular respiration releases energy from glucose through glycolysis, the link reaction, the Krebs cycle and the electron transport chain, producing ATP. The pathway differs in oxygen availability: aerobic respiration uses oxygen and yields more ATP, while anaerobic respiration produces much less ATP and forms lactic acid in muscles or ethanol and carbon dioxide in yeast.
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