Question

Ornithine cycle performs

• A. ATP synthesis
• B. Urea formation in spleen
• C. Urea formation in liver
• D. Urine formation in liver

Answer 1

The correct option is C Urea formation in liver

Ornithine cycle helps in excretion. It helps in conversion of excess of amino acids into urea in liver. It takes place in five major steps. The extra proteins in the body are degraded by the process of deamination where the NH${}_2$ group is removed and it is converted into ammonium ions in the liver. The ammonium ions enter urea cycle and get converted into urea. The urea formed in liver is transported to kidney through circulation and finally gets excreted. So, the correct answer is 'Urea formation in liver'.