The major and immediate nitrogenous waste product of protein metabolism is:
Correct answer: D. Ammonia
- A. Urea
- B. Uric acid
- C. Creatinine
- D. Ammonia
Explanation
Urea is the major and immediate nitrogenous waste product of protein metabolism in humans and most mammals. It is produced in the liver through the urea cycle, which converts toxic ammonia into urea, a less toxic compound, before it is excreted in urine. Uric acid, creatinine, and ammonia are also nitrogenous waste products but arise from different metabolic processes or are less prevalent as a direct result of protein metabolism.
This question appeared on the ETEA MDCAT 2008 paper, which you can sit online with every answer explained.
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About Excretion
Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.
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