MCQ practice · SSC Biology Board questions · Chapter 4: Bioenergetics
What is the amount of energy produced in the stimulus, in kilocalories?
Think it through first, then pick an option.
- a 7.3
- b 21.6
- c 30.5
- d 36.5
Answer and explanation
Correct answer: d 36.5
Five ATP breaking to ADP release 5 × 7.3 = 36.5 kcal.
Why the other options are wrong
- a 7.3: 7.3 is the energy of just one mole of ATP; the stimulus breaks 5 ATP, so multiply by 5.
- b 21.6: 21.6 is not a correct product; 5 × 7.3 does not give it.
- c 30.5: 30.5 resembles 30.55 kJ, the energy of one mole of ATP in kilojoules; it is not the kcal for 5 moles.
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