Four amino acids, Ala, Asp, Gln, and Glu, play key roles in nitrogen metabolism in animals. The structures of these amino acids, but not their names, are shown below. All four of these amino acids are readily converted into citric acid cycle intermediates.
After identifying the four amino acids and considering their structures, identify ALL of the following statements which are NOT true relative to their role in N metabolism in humans.
Select ALL that apply.