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In Ornithine cycle, which of the following wastes are removed from the blood?

1. CO₂ and urea
2. Ammonia and urea
3. CO₂ and ammonia
4. Urea and urine

Correct answer: CO₂ and ammonia

Solution

In the ornithine (urea) cycle, ammonia is converted into urea, and the carbon skeleton comes from carbon dioxide. These are the substances removed from the blood to form urea in the liver.

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