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AAFCS CFCS (FCS) Practice Tests & Test Prep by Exam Edge

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AAFCS Certified Family & Consumer Sciences Sample Test

1 of 5

Combining incomplete proteins that overlap is called ____.

Correct Answer:

complementary proteins.
combining incomplete proteins that overlap is called **complementary proteins**.

proteins are essential nutrients for the human body. they are made up of amino acids, which are the building blocks for muscle, bone, skin, hair, and many other tissues. there are 20 different amino acids that can form a protein. out of these, 9 are considered essential because the body cannot synthesize them and they must be obtained through diet.

a complete protein is a source of protein that contains an adequate proportion of all nine of the essential amino acids necessary for the dietary needs of humans or other animals. some examples of complete protein sources include meat, fish, eggs, and dairy products. however, many plant-based foods often lack one or more essential amino acids, making them incomplete proteins.

complementary proteins refer to two or more incomplete protein sources that, when eaten together, provide a complete set of essential amino acids. this concept is particularly important in vegetarian and vegan diets, where combining different plant-based sources of proteins is necessary to ensure that all essential amino acids are consumed.

for example, grains are typically low in lysine but high in methionine, while legumes are low in methionine but high in lysine. when grains and legumes are consumed together, such as rice with beans or whole wheat bread with peanut butter, they complement each other and create a balanced intake of essential amino acids, effectively forming a complete protein profile.

this practice of combining complementary proteins is crucial not just for maintaining a balanced diet but also for supporting various bodily functions, including muscle repair, immune function, and the production of enzymes and hormones. thus, understanding and applying the principle of complementary proteins can help individuals, especially those on plant-based diets, to meet their nutritional needs effectively.