Which of the following is not the nitrogenous waste?

Options

(a) creatinine
(b) guanine
(c) citrulline
(d) uric acid

Correct Answer:

citrulline

Explanation:

Urea and uric acid are the most common nitrogenous waste products. A few animals excrete nitrogen that comes from the metabolism of purines (eg, adenine and guanine).Birds, reptiles, and most terrestrial arthropods, such as insects, are called uricothelic organisms because they convert toxic ammonia to uric acid or the closely-related compound guanine (guano), rather than urea. Creatinine is found in urine along with uric acid.