10-05-2006, 09:35 PM
2. Amino acids that contribute with at least one nitrogen or carbon to the purine ring during the biosynthesis of purine nucleotides are
A) Alanine, asparagine, and lysine
B) Alanine, Methionine, and Histidine
C) aspartate, arginine, and histidine
D) aspartate, glycine, and glutamine
E) glycine, serine, and tyrosine