Apentix/AP Biology/Unit 3: Cellular Energetics/Question
AP Biologymediummcq1 pt

Why can ATP hydrolysis drive an endergonic cellular reaction when the reactions are appropriately coupled?

A.Coupled ATP hydrolysis can make the total free-energy change negative
B.Breaking a phosphate bond directly releases stored energy into nearby molecules
C.ATP changes the equilibrium constant of any reaction it contacts
D.ATP supplies genetic information that tells enzymes which products to make

Explanation

Core Concept

ATP hydrolysis is exergonic because the products are lower in free energy than the reactants. Cells couple that favorable reaction to an unfavorable one through shared intermediates or protein conformational changes so the combined ΔG is negative; energy is not released merely by breaking a bond.

Correct Answer

ACoupled ATP hydrolysis can make the total free-energy change negative

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