American Board of Surgery Qualifying Exam (ABS QE) Practice Test

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Which of the following amino acids is part of the branched-chain amino acids?

Glycine
Leucine
Serine
Tyrosine

The correct answer is: Leucine

Leucine is correctly identified as part of the branched-chain amino acids (BCAAs). These include leucine, isoleucine, and valine, which are characterized by their branched-chain structure. BCAAs play significant roles in muscle protein synthesis and energy production, making them essential for athletes and those engaged in intensive physical training. The other options provided do not belong to the BCAA classification. Glycine is a non-essential amino acid important for the synthesis of proteins but does not have a branched structure. Serine is also a non-essential amino acid that functions in various metabolic processes, including the synthesis of proteins and neurotransmitters. Tyrosine, while important for the synthesis of neurotransmitters such as dopamine, is classified as an aromatic amino acid rather than a branched-chain one. In summary, leucine is a key member of the branched-chain amino acids, essential for muscle metabolism and recovery.