What term describes proteins that contain all essential amino acids in the proper proportions?

What term describes proteins that contain all essential amino acids in the proper proportions?

• A. Incomplete proteins
• B. Complete proteins
• C. Complementary proteins
• D. Protein isolates

Answer: (B)

Understanding protein quality hinges on essential amino acids. The body cannot synthesize nine amino acids, so proteins that supply all of them in adequate amounts are considered complete. A complete protein supports all stages of tissue synthesis with a single source, so no additional balancing is needed at that meal. Animal-derived foods are typically complete; some plant foods, like quinoa and soy, are also complete. Incomplete proteins lack one or more essential amino acids or provide them in insufficient amounts, so combining different plant sources across the day (complementary proteins) can achieve a full essential amino acid profile. Protein isolates are processed products and do not define completeness by themselves. Therefore, the term describing proteins that contain all essential amino acids in the proper proportions is complete proteins.

Understanding protein quality hinges on essential amino acids. The body cannot synthesize nine amino acids, so proteins that supply all of them in adequate amounts are considered complete. A complete protein supports all stages of tissue synthesis with a single source, so no additional balancing is needed at that meal. Animal-derived foods are typically complete; some plant foods, like quinoa and soy, are also complete. Incomplete proteins lack one or more essential amino acids or provide them in insufficient amounts, so combining different plant sources across the day (complementary proteins) can achieve a full essential amino acid profile. Protein isolates are processed products and do not define completeness by themselves. Therefore, the term describing proteins that contain all essential amino acids in the proper proportions is complete proteins.