The protective outer layer surrounding most cells in bacteria, fungi, and plants is called what?

The protective outer layer surrounding most cells in bacteria, fungi, and plants is called what?

• A. Cell membranes
• B. Cell walls
• C. Nuclei
• D. Cytoplasm

Answer: (B)

The protective outer layer surrounding most cells in bacteria, fungi, and plants is the cell wall. This rigid layer provides structural support and protection, helping the cell maintain its shape and withstand internal pressure. It sits outside the cell membrane in these organisms, whereas the cell membrane is a flexible boundary found in all cells, the cytoplasm is the interior fluid, and nuclei are the organelles that house genetic material in eukaryotic cells. Different groups build their cell walls from different materials—peptidoglycan in bacteria, chitin in fungi, and cellulose in plants—yet the common feature across these organisms is that a cell wall serves as the protective outer boundary.

The protective outer layer surrounding most cells in bacteria, fungi, and plants is the cell wall. This rigid layer provides structural support and protection, helping the cell maintain its shape and withstand internal pressure. It sits outside the cell membrane in these organisms, whereas the cell membrane is a flexible boundary found in all cells, the cytoplasm is the interior fluid, and nuclei are the organelles that house genetic material in eukaryotic cells. Different groups build their cell walls from different materials—peptidoglycan in bacteria, chitin in fungi, and cellulose in plants—yet the common feature across these organisms is that a cell wall serves as the protective outer boundary.