Biology CLEP Prep Practice Exam

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What two macromolecules make up cell walls?

  1. Lipids and proteins

  2. Proteins and carbohydrates

  3. Carbohydrates and DNA

  4. Lipids and carbohydrates

The correct answer is: Lipids and carbohydrates

Cell walls are primarily composed of two macromolecules, namely lipids and carbohydrates. Lipids form a protective layer on the outside of the cell and help with structural support, while carbohydrates provide energy and also contribute to the structure and integrity of the cell wall. While proteins may be present in cell walls, they are not the primary components. Similarly, DNA is not a component of cell walls as it is contained within the cell itself. Therefore, the correct answer is lipids and carbohydrates, option D, as they form the main structural components of cell walls.

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