Multiple Choice
A _____ protein lacks or contains inadequate amounts of one or more of the essential amino acids.
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3. Amino Acids
Essential Amino Acids
Multiple Choice
A nonessential amino acid is one that:
A
Cannot be synthesized by humans in sufficient amounts and therefore must be obtained from the diet
B
Is not incorporated into proteins during translation
C
Can be synthesized by humans in sufficient amounts to meet physiological needs
D
Must be obtained from the diet because it lacks a nitrogen atom
Verified step by step guidance1
Understand the definition of essential and nonessential amino acids: Essential amino acids cannot be synthesized by the human body in sufficient amounts and must be obtained from the diet, whereas nonessential amino acids can be synthesized by the body in adequate amounts.
Analyze each option given in the problem to see which matches the definition of a nonessential amino acid.
Option 1 states that the amino acid cannot be synthesized by humans and must be obtained from the diet, which describes an essential amino acid, so this is incorrect for nonessential amino acids.
Option 2 says the amino acid is not incorporated into proteins during translation, which is incorrect because all standard amino acids, including nonessential ones, are incorporated into proteins.
Option 3 states that the amino acid can be synthesized by humans in sufficient amounts to meet physiological needs, which aligns with the definition of a nonessential amino acid, making this the correct choice.
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