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Conversion of ammonia to urea is done by ........ cycle :
A
Ornithine cycle
B
Arginine cycle
C
Fumaric cycle
D
Citrulline cycle
Detailed Solution
In the liver, ammonia and $CO_2$ are converted into urea through the ornithine cycle (urea cycle, Krebs–Henseleit cycle).
Ornithine combines with carbamoyl phosphate to form citrulline, which forms arginine; arginine is split by arginase into urea and ornithine, which is regenerated.
So ammonia is converted to urea by the ornithine cycle.
Ornithine combines with carbamoyl phosphate to form citrulline, which forms arginine; arginine is split by arginase into urea and ornithine, which is regenerated.
So ammonia is converted to urea by the ornithine cycle.