If a reaction doesn't release enough energy to generate 1 ATP, it can be repeated endlessly until it has pumped enough protons to generate 1 ATP. Chemiosmosis allows cells to save loose change, so to speak.
This image is linked to the following Scitable pages:
The proton gradients that power respiration are as universal as the genetic code itself, giving an insight into the origin of life and the singular origin of complexity.
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