Question

Which of the following cycles in liver is mainly responsible for the synthesis of urea?

• A. Citruline cycle
• B. Krebs cycle
• C. Nitrogen cycle
• D. Ornithine cycle

Answer 1

The correct option is D Ornithine cycle

The byproducts of protein metabolism like the ammonia and ammonium salts are toxic for the body. Hence they are converted to urea in the liver by a process known as urea cycle or ornithine cycle. The overall urea formation reaction is: 2 Ammonia + carbon dioxide + 3ATP ---> urea + water + 3 ADP.

So, the correct answer is option D.