A) Creatinine
B) Purine
C) Allantoin
D) Citrulline
Correct Answer: D
Solution :
Nitrogenous waste is any metabolic waste product that contains nitrogen. Creatinine is present in urine. Allantoin is the major nitrogenous waste in many insects. A few animals excrete nitrogen that comes from the metabolism of purines (eg, adenine and guanine). Among all the given options, citrulline is not a nitrogenous waste.
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