Which of the following amino acid can produce oxaloacetate directly in a single reaction?: (A) Alanine, (B) Cysteine, (C) Threonine, (D) Aspaate
Answer is D. Alanine, Cysteine and Threonine can also produce oxaloacetate but pyruvate only. Aspaate can directly produce oxaloacetate in a single step, i.e. transamination reaction.