Question

16 multiple choice 1 point which structure acts as the outer barrier of all cells? cell membrane cytoplasm nucleus cell wall

Explanation:

• The cell membrane is a universal outer barrier for all cells. It is a phospholipid bilayer that controls the movement of substances in and out of the cell.
• Cytoplasm is the jelly - like substance inside the cell, not an outer barrier.
• The nucleus is an organelle that contains genetic material and is not the outer barrier.
• The cell wall is not present in all cells (e.g., animal cells lack a cell wall).

Answer:

Cell membrane