alleryStart learning →What is energy coupling, as cells use it?
ALinking two endergonic reactions in a chain
BLinking exergonic ATP hydrolysis to endergonic reactions
CLinking two exergonic reactions to double the heat
DLinking a reaction to the diffusion of oxygen
Answer & Solution
Correct answer: B. Linking exergonic ATP hydrolysis to endergonic reactions
1. Endergonic reactions require an input of energy and will not take place on their own.
2. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
3. The energy released by the hydrolysis pays for the reaction that would otherwise stall.
4. Coupling two endergonic reactions provides no energy source, so nothing would run.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 6 "Metabolism", section 6.4 ATP: Adenosine Triphosphate_
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