MCQ practice · SSC Biology Board questions · Chapter 4: Bioenergetics
How many kilocalories of energy are stored in the terminal phosphate group of an ATP molecule?
Think it through first, then pick an option.
- a 5.6
- b 6.86
- c 7.3
- d 30.55
Answer and explanation
Correct answer: c 7.3
Each mole of ATP keeps about 7.3 kcal in its terminal phosphate group.
Why the other options are wrong
- a 5.6: 5.6 is not a value the book gives for ATP; it is easy to mix up with the 56 kcal of anaerobic respiration. The terminal phosphate holds 7.3 kcal.
- b 6.86: 6.86 echoes the 686 kcal of aerobic respiration (one mole of glucose); it is not the energy of ATP.
- d 30.55: 30.55 is the same energy in kilojoules; the question asks for kilocalories, which is 7.3.
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