In the process of amino acid biosynthesis, how are glutamic acid, glutamine, proline, and arginine all related?
a. They are all derived from -ketoglutarate.
b. They are all derivatives of acetyl CoA.
c. They are all derivatives of pyruvate.
d. They are all derived from aspartate.
e. They are all derivatives of 3-phosphoglycerate.
Question 2
The reaction, 2 NH4+ + -ketoglutarate + NADPH + ATP glutamine + NADP+ + ADP + Pi + H2O, is the combined result of what two enzymes?
a. nitrogenase and glutamate dehydrogenase (GDH)
b. GDH and glutamine synthetase (GS)
c. GS and nitrogenase
d. GDH and nitrogenase
e. all of these are correct
Question 3
What reaction does glutamate dehydrogenase (GDH) catalyze?
a. The oxidative deamination of glutamate to yield -ketoglutarate.
b. Phosphorylation of carbamate to yield carbamoyl phosphate.
c. The amidation of the carboxyl group of glutamate to form glutamine.
d. The deadenylation of glutamine synthetase (GS).
e. The adenylation of glutamine synthetase.
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