All cells, by definition, have a cell membrane. The cell membrane is a vital component that:
* Separates the cell's internal environment from its external environment.
* Controls what enters and exits the cell.
* Maintains the cell's shape and integrity.
Therefore, a cell without a membrane would not be a cell at all. It would simply be a collection of molecules without any structure or organization.
Perhaps you were thinking of something else? Can you clarify your question?
