9th Grade Biology SOL Practice Test

Proteins perform many important roles in the body. Enzymes, which are proteins, catalyze chemical reactions, helping processes occur faster. Proteins also provide structural support, such as collagen in connective tissues, and they transport substances, like hemoglobin carrying oxygen in the blood. Quick energy is not a typical function of proteins; the body mainly relies on carbohydrates and fats for energy. Proteins are used for energy mainly only during extreme conditions when other fuels are scarce. So the statement about quick energy does not reflect the usual role of proteins.