* Cell membrane: This is a fundamental structure found in all cells, both prokaryotes and eukaryotes. It's a thin, flexible barrier that controls what enters and exits the cell.
* Cell wall: This is a rigid, protective layer found outside the cell membrane. It provides structural support and protection.
Here's the breakdown:
* Prokaryotes (Bacteria and Archaea): They have a cell membrane AND a cell wall, often made of peptidoglycan.
* Eukaryotes (Plants, Animals, Fungi, Protists): They have a cell membrane.
* Plants and fungi: Have a cell wall, made of cellulose (plants) or chitin (fungi).
* Animals and protists: Do not have a cell wall.
In summary:
* All cells have a cell membrane.
* Only prokaryotes, plants, and fungi have a cell wall.
