Exam Review - Chapter 18

Catalyzed by ornithine transcarbamoylase 3 formation

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Unformatted text preview: a source of amino groups Glutaminase: converts glutamine to glutamate and NH4+ Alanine plays a special role in transporting amino groups via the pathway glucose- alanine cycle Glutamate can transfer its amino group to pyruvate through alanine aminotransferase Alanine passes into the blood and travels to the liver Alanine aminotransferase transfers amino group from alanine to alpha- ketoglutarate 18.2: Nitrogen Excretion and the Urea Cycle ureotelic: excreting amino nitrogen in the form of urea ammonia deposited in the mitochondria is converted to urea through the urea cycle Urea is produced through five enzymatic steps: 1. One amino group enters the urea cycle as carbamoyl phosphate 2. Formation of citrulline from ornithine and carbamoyl phosphate a. Carbamoyl phosphate donates its carbamoyl group to ornithine to form citrulline b. Catalyzed by ornithi...
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