Multiple Choice
Which statement best describes a complete protein in human nutrition?
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3. Amino Acids
Essential Amino Acids
Multiple Choice
Which pair of statements best describes an essential amino acid in human nutrition?
A
It can be synthesized by the human body from any carbon skeleton and therefore does not need to be obtained from the diet.
B
It is not required for protein synthesis but is needed solely for urea cycle function.
C
It is synthesized only in the liver and is required primarily as an energy source during fasting.
D
It cannot be synthesized in adequate amounts by the human body and therefore must be obtained from the diet.
Verified step by step guidance1
Step 1: Understand the definition of an essential amino acid. Essential amino acids are those that the human body cannot synthesize in sufficient quantities to meet physiological needs.
Step 2: Recognize that because the body cannot produce these amino acids adequately, they must be obtained through dietary intake to support vital functions such as protein synthesis.
Step 3: Contrast essential amino acids with non-essential amino acids, which the body can synthesize from various carbon skeletons and precursors.
Step 4: Evaluate the given statements by checking if they align with the core concept that essential amino acids must be obtained from the diet due to limited or absent biosynthesis in the body.
Step 5: Conclude that the statement 'It cannot be synthesized in adequate amounts by the human body and therefore must be obtained from the diet' best describes an essential amino acid in human nutrition.
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