Kaplan Nursing Entrance Practice Exam

Which nutrient class does cellulose belong to?

1. Proteins

2. Carbohydrates

3. Lipids

4. Nucleic acids

The correct answer is: Carbohydrates

Cellulose belongs to the class of carbohydrates. More specifically, it is an indigestible polysaccharide made up of chains of glucose molecules linked together. This structural carbohydrate is a key component of the cell walls in plants and provides rigidity and strength. In the context of nutrition, carbohydrates are classified into simple sugars (monosaccharides and disaccharides) and complex carbohydrates, with cellulose being a type of complex carbohydrate that is primarily used as dietary fiber in human nutrition. It plays a vital role in digestive health by aiding in bowel movement and supporting gut health, despite not being broken down by human digestive enzymes. Understanding the classification of cellulose as a carbohydrate highlights the importance of fiber in the diet, how it differs from other macronutrients like proteins, which are composed of amino acids; lipids, which include fats and oils; and nucleic acids, which are vital for genetic information. Recognizing these distinctions is crucial for nutrition science and diet planning.