Q. The end-product of ornithine cycle is
Solution:
The endproduct of ornithine cycle is urea. Most of the NH4+ 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.
