* Prokaryotic cells: Bacteria and archaea
* Eukaryotic cells: Animal cells, plant cells, fungi, protists
The cell membrane is a vital structure that separates the cell's internal environment from its external environment. It plays a critical role in:
* Regulating the passage of substances: It acts as a selective barrier, allowing some substances to pass through while blocking others.
* Maintaining cell shape: Provides structural support to the cell.
* Recognizing and responding to signals: Contains receptors that bind to signaling molecules, enabling the cell to communicate with its surroundings.
* Cell-to-cell communication: Participates in interactions between cells.
So, no matter the type of cell, you can always find a cell membrane surrounding it!
