VPY-0084
QUESTION
In birds the main end product of protein metabolism is?
OPTIONS
(A) Uric acid
(B) Allantoin
(C) Urea nitrogen
(D) Nitrate nitrogen
ANSWER
(A) Uric acid
EXPLANATION
Uric acid is the correct option because birds are uricotelic and convert most nitrogenous waste into uric acid, which is excreted with fecal material as a relatively insoluble paste and conserves water. Allantoin is the major end product in many mammals, urea is the principal nitrogenous waste in ureotelic animals, and nitrate nitrogen is not the normal major end product of protein metabolism.