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

Which statement best explains how ATP hydrolysis can be coupled to different kinds of cellular work?

A.ATP must always transfer its terminal phosphate directly to the final reactant
B.ATP works only by heating the local environment around an enzyme
C.ATP supplies electrons directly to every electron-transport chain
D.ATP hydrolysis can be coupled to chemical, transport, or mechanical work

Explanation

Core Concept

ATP hydrolysis is exergonic and can be coupled to endergonic cellular work. Depending on the system, coupling may involve phosphorylation of a substrate or protein, a conformational change in a transport protein or motor, or another shared intermediate. Direct phosphate transfer to the final reactant is not a universal mechanism.

Correct Answer

DATP hydrolysis can be coupled to chemical, transport, or mechanical work

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