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In animals that excrete urea, the conversion of ammonia into urea occurs through which biological pathway?

1. The transformation of ammonia into urea takes place via the Ornithine cycle.
2. The transformation of ammonia into urea takes place via the Krebs cycle.
3. The transformation of ammonia into urea takes place via glycolysis.
4. The transformation of ammonia into urea takes place via the Calvin cycle.

Correct answer: The transformation of ammonia into urea takes place via the Ornithine cycle.

Solution

Ureotelic animals convert ammonia into urea through the Ornithine cycle (urea cycle), which occurs in the liver. This process detoxifies ammonia, a toxic byproduct of protein metabolism.

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