Amino Acid Metabolism — Flashcards

_____ may be converted to tyrosine via the enzyme phenylalanine hydroxylase (with tetrahydrobiopterin as a cofactor)

_____ is an obligate activator of carbamoyl phosphate synthetase I

_____ may be converted to epinephrine via the enzyme phenylethanolamine-N-methyltransferase (with SAM as a cofactor) and stimulated by cortisol

In the liver, alanine transfers its NH3 group to _____, forming glutamate and pyruvate

In the first step of the urea cycle, CO2 and NH4+ are combined to form _____ via the enzyme carbamoyl phosphate synthetase I (requires 2 ATP)

In the first step of thyroid hormone synthesis, _____ is synthesized from tyrosine in the thyroid follicular cells

Arginine may be broken down into _____ and urea via the enzyme arginase

The urea cycle begins with _____, CO2, and 2 ATP

_____ (from tyrosine) may be converted to maleylacetoacetate via the enzyme homogentisate oxidase

_____ may be converted to melanin via the enzyme tyrosinase