A) \[N{{H}_{3}}\] and \[C{{O}_{2}}\] are present in liver only
B) hormone ADH is found in liver only
C) enzyme arginase is present in liver only
D) kidney is smaller than liver
Correct Answer: C
Solution :
Urea synthesis takes place in liver through ornithine cycle. In liver, one molecule of \[C{{O}_{2}}\]is activated by biotin and combines with two molecules of \[N{{H}_{3}}\] in the presence of carbamyl phosphate synthetase enzyme and 2 ATP to form carbamyl phosphate and one molecule of \[{{H}_{2}}O\] is released. Carbamyl phosphate react with ornithine arid form citrulline that combines with another molecule of \[N{{H}_{3}}\] and form argininee. Arginme is broken into urea and ornithine in the presence of an enzyme arginase and water.
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