Question
Biology Question on excretory products and their elimination
The end-product of ornithine cycle is
A
carbon dioxide
B
uric acid
C
urea
D
ammonia
Answer
urea
Explanation
Solution
The endproduct of ornithine cycle is urea. Most of the NH formed by deamination of amino acids in the liver is converted to urea, and the urea is excreted in the urine. The synthesis of urea via ornithine cycle involves conversion of the amino acid ornithine to citrulline and then to arginine, following which urea is split off and ornithine is regenerated.