Abstract

A hallmark of living matter is its ability to extract and transform energy from the environment. Not surprisingly, biology students are required to take thermodynamics. The necessity of coupling exergonic reactions to endergonic processes is easily grasped by most undergraduate students. However, when addressing the thermodynamic concept of coupled reactions, both students and textbook authors often make claims that clash with the Second Law of Thermodynamics. Herein, I point out the most common flaws, analyze the causes leading to these mistakes, and suggest a few rules to avoid them.

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