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Multiple Choice
Which of the following best describes complete proteins, and where are they most commonly found?
A
Proteins that contain all essential amino acids; primarily found in animal products such as meat, eggs, and dairy.
B
Proteins that are only found in plant sources like beans and lentils.
C
Proteins that lack one or more essential amino acids; mainly found in fruits and vegetables.
D
Proteins that are synthesized only in the human body and not obtained from the diet.
Verified step by step guidance
1
Step 1: Understand the concept of complete proteins. Complete proteins are those that contain all nine essential amino acids, which are amino acids the human body cannot synthesize and must obtain from the diet.
Step 2: Recognize the sources of complete proteins. These are primarily found in animal products such as meat, eggs, and dairy. Some plant-based sources, like quinoa and soy, also qualify as complete proteins.
Step 3: Differentiate between complete and incomplete proteins. Incomplete proteins lack one or more essential amino acids and are typically found in plant sources like beans, lentils, fruits, and vegetables.
Step 4: Eliminate incorrect options. Proteins synthesized only in the human body are not relevant to dietary complete proteins, and proteins found only in plant sources are typically incomplete unless combined to form complementary proteins.
Step 5: Select the correct description based on the definition and sources of complete proteins: 'Proteins that contain all essential amino acids; primarily found in animal products such as meat, eggs, and dairy.'