Multiple Choice
Which of the following amino acids contains a positively charged (basic) side chain at physiological pH?
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3. Amino Acids
Amino Acid Groups
Multiple Choice
In humans, which amino acid is the most abundant in the body (by total free and protein-bound content)?
A
Glycine
B
Alanine
C
Glutamine
D
Leucine
Verified step by step guidance1
Understand that the question asks for the amino acid most abundant in the human body considering both free and protein-bound forms.
Recall that amino acids in the body exist either incorporated into proteins or as free amino acids in tissues and plasma.
Recognize that while glycine, alanine, and leucine are common amino acids, glutamine is known to be the most abundant free amino acid in the bloodstream and tissues, and also widely incorporated in proteins.
Consider that glutamine plays a critical role in nitrogen transport and metabolism, which contributes to its high abundance.
Conclude that based on biochemical knowledge, glutamine is the most abundant amino acid in the human body by total free and protein-bound content.
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