Which of the following are true statements? 1) Phenylalanine is synthesized in t

Question

Which of the following are true statements?

1) Phenylalanine is synthesized in the body by the transamination of a-ketoglutarate.

2) The carbon sources for nonessential amino acid synthesis include metabolic pathway intermediates and a-keto acids.

3) The carboxyl groups of all the nonessential amino acids are derived from glutamate.

4) Synthesis of the amino acid alanine involves reduction (that is, the precursor is reduced); its degradation involves oxidation.

5) The synthesis of alanine from pyruvate, an a-keto acid, involves the oxidation of pyruvate.

Explanation / Answer

3) The carboxyl groups of all the nonessential amino acids are derived from glutamate.

4) Synthesis of the amino acid alanine involves reduction (that is, the precursor is reduced); its degradation involves oxidation.

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