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In organisms that excrete urea, the compound is synthesized through the Ornithine cycle. This process occurs when two ammonia molecules react with one carbon dioxide molecule in the presence of Ornithine, citrulline, arginine, and the enzyme arginase. Where does this cycle take place?

1. The kidney is the site of urea production.
2. The liver is responsible for urea synthesis.
3. Urea is produced in the lungs.
4. The pancreas is where urea is formed.

Correct answer: The liver is responsible for urea synthesis.

Solution

Ureotelic animals produce urea in the liver through the Ornithine cycle (urea cycle), where ammonia and carbon dioxide are converted into urea. This process does not occur in the kidney, lungs, or pancreas.

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