Question

The nitrogenous excretory products are formed from the catabolism of amino acids by

• A. Calvin cycle
• B. Nitrogen cycle
• C. Ornithine cycle
• D. Krebs cycle

Answer 1

The correct option is C Ornithine cycle

Ornithine cycle is also called the urea cycle. Urea is the end product of amino acid metabolism. Urea synthesis is a five-step cyclic process, with five distinctive enzymes. Hence the nitrogenous excretory products(Urea) are formed from the catabolism of amino acids by Ornithine cycle.urea is synthesized in the liver and transported to kidneys for excretion in urine.

So, the correct answer is 'Ornithine cycle'.