* Lack of Metabolism: Cell membranes don't perform metabolic processes like respiration or energy production. They are simply structures that provide boundaries and control movement.

* No Growth or Reproduction: Cell membranes don't grow or reproduce independently. They are formed and maintained by the living cell itself.

* No Responsiveness: Cell membranes don't exhibit any independent response to stimuli or changes in the environment. They are passive structures that react to the environment as directed by the cell.

However, it's important to remember that cell membranes are essential for the survival and functioning of living cells. They play a crucial role in:

* Enclosing the cell: Providing a physical barrier between the cell's internal environment and the external environment.

* Regulating the movement of substances: Controlling which molecules can enter and leave the cell.

* Maintaining cell shape: Providing structural support to the cell.

* Cell signaling: Participating in communication between cells.

So, while not living themselves, cell membranes are vital components of living cells and contribute significantly to their life processes.