What is the role of xanthine oxidase in purine degradation?
Nucleotide Metabolism | Degradation of Uric Acid

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Science, Biology, Chemistry
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7 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
It synthesizes purines from amino acids.
It converts uric acid to ammonia.
It degrades uric acid to allantoin.
It converts xanthine to uric acid.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why do humans excrete uric acid instead of allantoin?
Humans have a functional urate oxidase gene.
Humans excrete allantoin instead of uric acid.
Humans have a nonfunctional urate oxidase gene.
Humans lack the gene for urate oxidase.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which organisms excrete uric acid due to the absence of the urate oxidase gene?
Marine invertebrates
Most mammals
Birds, reptiles, and insects
Humans and primates
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary purine degradation product excreted by most mammals?
Allantoate
Ammonia
Uric acid
Allantoin
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which enzyme converts allantoin to allantoate in bony fishes?
Allantoicase
Urease
Allantoinase
Urate oxidase
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the final purine degradation product excreted by amphibians?
Uric acid
Ammonia
Allantoin
Urea
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which organisms excrete ammonia as the final purine degradation product?
Amphibians
Birds and reptiles
Marine invertebrates
Most mammals
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