In the initial steps of amino acid catabolism, a crucial enzymatic reaction prepares amino acids for further degradation. What is the primary role of transamination in this process?
Show answer and explanation
The answer
Correct answer: A. To transfer the amino group from an amino acid to an alpha-keto acid, generating a new amino acid and a corresponding alpha-keto acid.
Tested concept: Amino acid catabolism and transamination
Explanation
Transamination is the initial step in the catabolism of most amino acids. It involves the transfer of the amino group from an amino acid to an alpha-keto acid, typically alpha-ketoglutarate, forming a new amino acid (glutamate) and a new alpha-keto acid (derived from the original amino acid). This process collects amino groups into a single molecule (glutamate) for eventual removal via the urea cycle. Distractor 1 describes deamination, which is the removal of ammonia, often following transamination. Distractor 2 describes protein synthesis, not catabolism. Distractor 3 describes the complete oxidation of the carbon skeleton, which occurs after the amino group has been removed and the carbon skeleton enters metabolic pathways like the citric acid cycle.
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