The hydrolysis of the terminal phosphate bond of one molecule of ATP to give ADP releases approximately
Correct answer: D. 7.3 kcal of energy
- A. 0.7 kcal of energy
- B. 73 kcal of energy
- C. 700 kcal of energy
- D. 7.3 kcal of energy
Explanation
Each terminal phosphate bond of ATP yields about 7.3 kcal per mole on hydrolysis, a packet of energy well matched to the needs of single cellular reactions. The figure 73 kcal is ten times too large, a common misread of the same fact.
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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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