All of the following are true of the urea cycle EXCEPT:
A) It helps in the excretion of excess nitrogen.
B) It is mainly confined to the liver.
C) It is linked to the citric acid cycle through fumarate.
D) Stimulation of carbamoyl-phosphate synthetase I (CPS-I) decreases the activity of the urea cycle.
E) It is completed by the regeneration of ornithine from arginine.
Correct Answer:
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