In humans, end product of purine metabolism -
Allantoin
Uric acid
CO,
None
Ans. is 'b' i.e., Uric acid Catabolism of purine nucleotideso Humans catabolize purines (adenine and guanine) to uric acid.o In mammals other than higher primates (in non primate mammals), uric acid is converted to water soluble allantion by enzyme 'uncase'. However, human lack uricase, therefore the end product of purine catablism is uric acid, which is excreted.
Metabolism of Purines and Pyrimidines