Final answer:
The nitrogenous product excreted from purine degradation is uric acid. It is produced via metabolic breakdown of purine nucleosides and although the specific enzyme for its conversion in the question is not mentioned, enzymes like PRPP synthetase are involved in purine metabolism. Humans mainly excrete urea, with lesser quantities of ammonium and uric acid.
Step-by-step explanation:
Excretion of Nitrogenous Wastes from Purine Degradation
The nitrogenous product of purine degradation that is excreted is uric acid. Purines are metabolized through a series of steps into uric acid, which is an end product in humans and other primates. During this catabolic process, purine nucleosides are broken down and eventually converted into uric acid. The enzyme involved in the conversion of nucleosides to uric acid is not specified in the provided text. However, various enzymes work sequentially during the catabolism of purines. An example of an enzyme linked with purine metabolism, specifically mentioned in relation to disorders like gout, is PRPP synthetase, although it is involved earlier in purine synthesis rather than the breakdown into uric acid.
In the context of general excretion of nitrogenous waste, animals including humans detoxify the ammonia generated from amino acid deamination and convert it into less toxic compounds like urea and uric acid. In humans, the liver rapidly converts most of the ammonia into urea, which is the primary nitrogenous waste in human urinary excretions, with small amounts of ammonium and uric acid present.