Purine
... enzymes , including xanthine oxidase , into
uric acid . High levels of
uric acid can predispose to gout when the acid ... urease enzyme that can further degrade
uric acid. The deficiency of another enzyme, ...
Enzyme
...
Urease : hydrolizes urea into carbon dioxide and ammonia
Xanthine oxidase : oxidizes hypoxanthine to xanthine and further to
uric acid
Purification
Since enzymes are proteins , enzyme purification begins with protein purification . Each step in the purification ...
Excretion
... , amoebae , and various parasitic worms . Urine, on the other hand, contains excess water, salt, and protein waste in the form of urea as
uric acid, and seldom any pathogens; should a person be in a situation of insufficient water and in danger of overheating due to lack of persperation, ...
Osmoregulation
... and is generally converted to less toxic substances after it is produced then excreted; mammals convert ammonia to urea while birds and reptiles form
uric acid to be excreted with other wastes via their cloacas.
How osmoregulation is achieved in vertebrates
Four processes occur:
filtration ...
Protein
... substance. It is then converted in the liver into urea , a much less toxic chemical, which is excreted in urine . Some animals convert it into
uric acid instead.
Protein nutrition in humans
In terms of human nutritional needs, proteins come in two forms: complete proteins contain all ...
Urea cycle
... than ammonia, therefore organisms which can't easily and quickly remove ammonia usually have to convert it to some other substance, like urea or
uric acid . Insufficiency of the urea cycle occurs in some genetic disorders ( inborn errors of metabolism ), and in liver failure . The result in ...