Wild type e. coli can synthesize all 20 common amino acids, but some mutants, called amino acid auxotrophs, are unable to synthesize a specific amino acid and require its addition to the culture medium for optimal growth. Besides their role is protein sythesis, some amino acids are also precursers for other nitrogenous cell products. Consider the following amino acid auxotrophs that are unable to synthesize the identified amino acid. For each mutant, what nitrogenous products other than proteins would the cell fail to syntehsize?

a. glycine
b. glutamine
c. aspartate