NCSF Sport Nutrition Specialist Certification Practice Test – Complete Exam Prep

The statement that complete proteins do not exist in plant sources is false because there are indeed plant sources that are considered complete proteins. A complete protein contains all nine essential amino acids in proportions that meet the body's requirements. While it's true that many plant proteins are classified as incomplete because they lack one or more essential amino acids, there are exceptions, such as quinoa, soy, and chia seeds, which provide all essential amino acids.

The other statements are true. Complete proteins are commonly found in animal dietary sources, such as meat, fish, eggs, and dairy products, where they naturally provide all essential amino acids. They play a vital role in muscle health because protein is critical for repairing and building muscle tissue. Additionally, it is possible to combine various incomplete protein sources, such as beans with rice, to form a complete protein profile, which is important for vegetarians and vegans to ensure they meet their amino acid needs.