This deep dive examines the "final fate" of amino acids—what happens when they are not used for protein synthesis. Because the body has no storage facility for excess amino acids, they must be actively catabolized, a process that balances the need for energy and glucose against the challenge of disposing of toxic nitrogen. We explore the sophisticated chemical "swapping" used to transport nitrogen safely to the liver and the distinct evolutionary strategies animals use to excrete waste while conserving water and energy.

Topic Outline

• The Two Pillars of Catabolism

◦ Understanding the two-step process: Deamination (the loss of the amino group to create ammonia) and the subsequent utilization of the remaining carbon skeleton.

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