2. Which of the following is true about chemical energy? A. Chemical energy is released when bonds in ADP are broken to form ATP. B. Chemical energy can be stored more efficiently as glucose than it can be as ATP. C. Chemical energy is stored when bonds in ATP are broken to form ADP. D. Chemical energy can only be stored as ADP.
Biology · High School · Tue Nov 03 2020
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Answer A is correct - energy is released when bonds in ADP are broken to form ATP.
ATP -> ADP releases energy by two mechanisms. First because the process of hydrolysing the y-phosphate (the terminal phosphate) releases energy. And second because ATP and ADP are maintained out of equilibrium in cells. The action of utilizing an ATP brings the system closer to equilibrium, which releases energy.