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Question

Which of the following is a nitrogenous waste?

A
Creatinine
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B
Creatine
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C
Guanine
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D
All of the above
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Solution

The correct option is D All of the above
Creatine is normally found in meat and fish. It is also naturally made in the human body in the kidney and liver. It is mainly stored in muscles and converted to creatinine. It is the breakdown product of creatine phosphate. It is a chemical waste product that is produced by mainly muscle metabolism and by eating excess meat products. Kidneys filter creatinine through urine. Birds, reptiles, and most terrestrial arthropods, such as insects, are called uricotelic organisms because they convert toxic ammonia to uric acid or the closely related compounds guanine (guano), rather than urea.
So, the correct answer is option D.

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