Proteins that lack one or more essential amino acids are said to be what?

• A. Incomplete proteins
• B. Essential proteins
• C. Non-essential proteins
• D. Complete proteins

Answer: (A)

Verified step by step guidance

1. Understand the definition of essential amino acids: These are amino acids that cannot be synthesized by the body and must be obtained from the diet.
2. Recognize that proteins are made up of amino acids, and the presence or absence of essential amino acids determines the classification of the protein.
3. Learn the definition of complete proteins: These contain all the essential amino acids in the right proportions needed by the body.
4. Learn the definition of incomplete proteins: These lack one or more of the essential amino acids.
5. Based on the definitions, identify that proteins lacking one or more essential amino acids are classified as incomplete proteins.