Allantoin is the end product of metabolism of -
Glycogen
Purine
Pyrimidine
Histidine
Ans. is 'b' Le., Purine o In non-primate mammals, end product of purine metabolism is allantoin due to presence of enzyme uricase. Uricase convenes uric acid to allantoin.o Humans lack the enzyme uricase. Therefore, end product of purine catabolism in humans is uric acid.
Metabolism of Purines and Pyrimidines