What enzyme is deficient in Lesch-Nyhan syndrome?
Adenine phosphoribosyltransferase (APRT)
Hypoxanthine-guanine phosphoribosyltransferase (HGPRT)
Uridine phosphorylase
Uridine kinase
The urea cycle is vital to the excretion of ammonia, a harmful byproduct of amino acid breakdown.
What enzyme in the urea cycle converts L-ornithine to L-citrulline?
Argininosuccinate lyase
Ornithine transcarbamylase
Argininosuccinate synthetase
Ornithine synthetase
