Hydrolysing one mole of ATP into ADP and inorganic phosphate releases about:
A1.3 kcal per mole
B4.3 kcal per mole
C7.3 kcal per mole
D9.3 kcal per mole
Answer & Solution
Correct answer: C. 7.3 kcal per mole
1. The high-energy bonds sit between the second and third phosphate groups.
2. Breaking one leaves products with considerably lower free energy than the reactants.
3. The calculated free energy change for the hydrolysis of one mole of ATP into ADP and Pi is minus 7.3 kcal per mole.
4. Inside a living cell the figure is nearly double that, about minus 14 kcal per mole.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 6 'Metabolism', sections 6.1-6.5_
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