Multiple Choice
Which macromolecule forms the foundation for the structure and activities of living cells?
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4. Biomolecules
Introduction to Biomolecules
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Which of the following statements is true about complete protein sources?
A
They lack one or more essential amino acids.
B
They cannot be digested by humans.
C
They contain all essential amino acids required by the human body.
D
They are only found in plant-based foods.
Verified step by step guidance1
Understand the concept of complete protein sources: Complete proteins are those that contain all nine essential amino acids that the human body cannot synthesize and must obtain through diet.
Review the definition of essential amino acids: Essential amino acids are amino acids that the body cannot produce on its own and must be obtained from food sources. Examples include lysine, methionine, and tryptophan.
Evaluate the first statement: 'They lack one or more essential amino acids.' This is incorrect because complete protein sources, by definition, contain all essential amino acids.
Evaluate the second statement: 'They cannot be digested by humans.' This is incorrect because complete protein sources are digestible and provide essential nutrients to the human body.
Evaluate the fourth statement: 'They are only found in plant-based foods.' This is incorrect because complete protein sources are found in both animal-based foods (e.g., meat, eggs, dairy) and some plant-based foods (e.g., quinoa, soy). The correct statement is: 'They contain all essential amino acids required by the human body.'
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