Biology CLEP Prep Practice Exam

What type of molecule is found in the cell wall of a plant cell, providing structural support?

1. RNA

2. Glucose

3. Lipids

4. Cellulose

The correct answer is: Cellulose

Plant cells contain cellulose, a type of carbohydrate found in the cell wall. RNA, or ribonucleic acid, is responsible for protein synthesis and is not found in the cell wall. Glucose is a type of sugar and provides energy for the cell, but is not a major component of the cell wall. Lipids, or fats, are also not typically found in the cell wall of a plant cell. Instead, lipids are often found in the cell membrane, providing a barrier between the cell and its environment. Therefore, the correct answer is D, cellulose. Cellulose is a type of polysaccharide that forms a strong, rigid structure in the cell wall, giving the plant cell its shape and providing support for the plant as it grows.