Multiple Choice
A nonessential amino acid is one that:
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3. Amino Acids
Essential Amino Acids
Multiple Choice
In the context of dietary protein quality and essential amino acids, what is meant by a "limiting amino acid" in a protein source?
A
An amino acid that is present in excess and must be converted to glucose via gluconeogenesis
B
An amino acid that cannot be absorbed in the small intestine and is therefore excreted
C
The essential amino acid present in the lowest proportion relative to human requirements, thereby limiting the extent of protein synthesis from that protein source
D
A nonessential amino acid that becomes essential only during fasting
Verified step by step guidance1
Understand that proteins are made up of amino acids, some of which are essential, meaning they must be obtained from the diet because the body cannot synthesize them.
Recognize that the quality of a dietary protein depends on its amino acid composition, especially the presence and proportion of essential amino acids relative to human needs.
Define the term 'limiting amino acid' as the essential amino acid found in the smallest amount relative to the body's requirements in a given protein source.
Explain that this limiting amino acid restricts the body's ability to use the protein for synthesis because protein synthesis requires all essential amino acids in adequate amounts.
Conclude that if one essential amino acid is deficient, it limits the overall use of the protein, regardless of the abundance of other amino acids.
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