Breaking of terminal phosphate of ATP releases about ___________ Kcal of energy?
Correct answer: D. 7.3
- A. 6.1
- B. 6.3
- C. 7.1
- D. 7.3
Explanation
Hydrolysis of ATP's terminal phosphate releases about 7.3 kcal per mole of ATP under standard biochemical conditions. Students may choose 6.1 kcal per mole because energy values vary with conditions, but 7.3 kcal per mole is the standard textbook value used for ATP hydrolysis.
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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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