What is the function of the cell wall?

• A. It provides structural support and protection; it is permeable
• B. It stores genetic material
• C. It generates energy for the cell
• D. It controls cell division

Answer: (A)

The main idea is that the cell wall provides structural support and protection for the cell, while still allowing passage of water and small molecules. It gives the cell its shape and helps it resist osmotic pressure so it doesn’t burst in a hypotonic environment. Although it is rigid, it is permeable, meaning substances can move through it, which helps hydration and nutrient flow. The cell wall is located outside the cell membrane and is made of materials like cellulose in plants (and different materials in fungi and bacteria). It’s not where genetic material is stored (that’s the nucleus), nor where energy is generated (that happens in mitochondria), nor where division is controlled (that involves the nucleus and other cellular machinery). So, its role best describes structural support and protection, with permeability to allow necessary substances to pass.