What enzyme is deficient in Lesch-Nyhan syndrome?
Hypoxanthine-guanine phosphoribosyltransferase (HGPRT)
Uridine kinase
Uridine phosphorylase
Adenine phosphoribosyltransferase (APRT)
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 synthetase
Ornithine synthetase
Ornithine transcarbamylase
Argininosuccinate lyase
