Question

multiple choice question
in which metabolic pathway is ammonia combined with carbon dioxide in the liver to produce a less toxic waste?

• anaerobic fermentation
• the citric acid cycle
• the urea cycle
• beta oxidation

Explanation:

To solve this, we analyze each option:

• Anaerobic fermentation: Involves producing energy without oxygen, not related to ammonia and CO₂ in the liver.
• The citric acid cycle: Involved in energy production (ATP), not ammonia detoxification.
• The urea cycle: Occurs in the liver, where ammonia (toxic) combines with CO₂ to form urea (less toxic waste).
• Beta oxidation: Breaks down fatty acids for energy, not related to ammonia processing.

Answer:

C. The urea cycle