Energy and Metabolism

ID #1087

How is converting ATP to ADP endergonic? I thought energy is released.


Please remember to keep the proper frame of reference. You're right -- the hydrolysis of ATP into ADP and Pi is an exergonic process. Energy is released. But the word endergonic, as I tried to say over and over in lecture, will always refer to the metabolic pathway unless you're told otherwise. So Step 1 in glycolysis is endergonic. It takes energy to add a phosphate group onto glucose, and this energy is provided by the coupled exergonic hydrolysis of ATP.

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