Practice Quiz

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Category - Nutrition

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Which of the following is not one of the three main classes of foods and sources of energy?
  1. Carbohydrates
  2. Substrates
  3. Lipids
  4. Protein
Explanation
Answer - B - Substrates are not one of the three main classes of foods and sources of energy. Food is broken down by the digestive system into by-products, which are referred to as substrates. A substrate is the material on which an enzyme acts. Carbohydrates, lipids, and protein are the three main classes of foods and sources of energy.
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