Apentix/AP Biology/Unit 3: Cellular Energetics/Question
AP Biologyeasymcq1 pt

Hydrolysis of ATP to ADP and inorganic phosphate releases usable free energy primarily because the products...

A.absorb heat, making the overall reaction strongly endothermic
B.are stabilized by resonance and by relief of electrical repulsion among closely packed negative charges
C.contain an adenine base holding more bond energy than before
D.store their newly freed energy inside the ribose sugar ring

Explanation

Core Concept

The three phosphate groups pack many negative charges onto one small molecule. Hydrolysis separates ADP from the terminal phosphate, relieving this electrostatic repulsion. The resulting inorganic phosphate is additionally stabilized by resonance forms unavailable in intact ATP. Products therefore sit at lower free energy than reactants, and cells couple the difference to work through phosphorylated intermediates.

Correct Answer

Bare stabilized by resonance and by relief of electrical repulsion among closely packed negative charges

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