A) Calvin cycle
B) nitrogen cycle
C) ornithine cycle
D) Krebs cycle
Correct Answer: C
Solution :
The urea cycle also known as the ornithine cycle, is a cycle of biochemical reactions occurring in many animals that produces urea \[[{{(N{{H}_{2}})}_{2}}CO]\]from ammonia \[(N{{H}_{3}}).\]This cycle was the first metabolic cycle discovered by Hans Krebs and Kurt Henseleit in 1932. In mammals, the urea cycle takes place primarily in the liver, and to a lesser extent in the kidney.
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