Question

The characteristic that is shared by urea, uric acid and ammonia is/are
(A) They are nitrogenous wastes
(B) They all need very large amount of water for excretion
(C) They are all equally toxic
(D) They are produced in the kidneys

• A. A, C and D
• B. A and D
• C. A, C and B
• D. A only

Answer 1

The correct option is D A only

When proteins, amino acids or nucleic acids are catabolized, 3 nitrogen containing predominant excretory end products are formed. They are ammonia, urea and uric acid. The toxicity of them is not same. They are excreted in different forms by different animals. Ammonotelic organism secretes water soluble toxic ammonia. Urea is excreted by ureotelic organism. Uric acid is secreted by uricotelic organism.

So, the correct answer is option D.