Compare and contrast Exergonic and Endergonic reactions - include a model of each showing the change in free energy from reactants and products.
Exergonic - Catabolic reactions. They break down substances and require no energy, so they are able to occur spontaneously. The change in free energy in these reactions are negative because the reactions break DOWN to create products.
Endergonic - Anabolic reactions. They build up substances and require energy to do so. As a result, these reactions can only occur when energy is available. The change in free energy in these reactions are positive because reactants work UP to create a product.
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