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In ureotelic animals, urea is formed by the

1. Arginine cycle
2. Cori's cycle
3. Ornithine cycle
4. EM pathway

Correct answer: Ornithine cycle

Solution

In ureotelic animals, excess nitrogen is converted to urea through the urea cycle, also called the ornithine cycle. This pathway occurs mainly in the liver and helps safely eliminate toxic ammonia.

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