Multiple Choice
Proteins are polymers; what type of monomer units are proteins made of?
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1. Introduction to Biochemistry
Proteins
Multiple Choice
In human nutrition, what best defines an incomplete protein?
A
A protein that cannot be digested because it contains only peptide bonds in the D-configuration
B
A protein that has not reached its native tertiary structure and is therefore always nonfunctional
C
A protein made only of nonessential amino acids and no essential amino acids
D
A dietary protein that lacks one or more essential amino acids in sufficient amounts to meet human needs
Verified step by step guidance1
Understand the concept of essential and nonessential amino acids: Essential amino acids cannot be synthesized by the human body and must be obtained from the diet, while nonessential amino acids can be made by the body.
Recognize that a complete protein contains all essential amino acids in adequate amounts necessary for human nutrition.
Define an incomplete protein as one that lacks one or more essential amino acids or does not have them in sufficient quantities to meet human dietary needs.
Note that the other options are incorrect because: proteins with D-configuration peptide bonds are not typical in human nutrition; proteins not in their native tertiary structure may be nonfunctional but this does not define completeness; and proteins made only of nonessential amino acids do not meet the definition of incomplete protein as commonly used in nutrition.
Conclude that the best definition of an incomplete protein is a dietary protein that lacks one or more essential amino acids in sufficient amounts to meet human needs.
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