Question

The end-product of ornithine cycle is (a) carbon dioxide (b) uric acid (c) urea (d) ammonia.

Answer 1

The correct option is (c) urea.

Explanation:

In ornithine cycle urea (H2N -Co -NH2) is formed from two molecules of ammonia and one molecule of CO2 .A molecule of ammonia combines with CO2 in mitochondrion to form carbamoyl phosphate. In the cytoplasm it reacts with ornithine producing citrulline. Citrulline accepts another molecule of NH4+ giving rise to arginine. Arginine is hydrolysed into urea and ornithine with the help of enzyme arginase.


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Answer 2

Answer:

Urea option (C)

Explanation:

Here,

In ornithine cycle , the end product is urea.

Urea is formed by one molecule of carbon dioxide and two molecules of ammonia .In this reaction, a molecule of ammonia get reacted with co2 in mitochondrion and Carbamoyl phosphate is formed. It also react with Ornithine  in cytoplasm and Citrulline is formed. Citrulline accepts NH4 + which form arginine. Than arginine is hydrolyzed  into ammonia.

Hence, the correct answer is urea