Which two statements are correct? Which two of the following phrases describing

Question

Which two statements are correct?

Which two of the following phrases describing the synthesis of amino acids are accurate? Select all the true statements. The synthesis of alanine from pyruvate, an alpha-keto acid, involves the oxidation of pyruvate. The carboxyl groups of all the nonessential amino acids are derived from glutamate. Valine is an essential amino acid and is synthesized in the human body by the transamination of alpha-ketoglutarate. Synthesis of the amino acid alanine involves reduction (that is, the precursor is reduced); its degradation involves oxidation. The carbon sources for nonessential amino acid synthesis include metabolic pathway intermediates and alpha-keto acids.

Explanation / Answer

1) False : formation of alanine is by transamination from glutamate onto pyruvate.

2) False: Gluatamate is precursor of only 3 amino acids viz. proline, ornithine and arginine.

3) False: a transamination catalyzed either by an alanine-valine transaminase or a glutamate-valine transaminase results in valine.

4) True

5) True

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