Which of the following amino acids becomes conditionally essential for those with urea cycle disorders, and thus should be supplemented in their diet?
a. valine
b. arginine
c. alanine
d. histidine
Question 2
Which of the following urea cycle enzyme deficiencies is inherited as an X-linked dominant trait that is usually lethal in males?
a. argininosuccinic acid synthase
b. carbamyl phosphate synthase I
c. ornithine transcarbamylase
d. arginase
