Final answer:
The function not performed by cell membranes is providing compartments within the cell for different activities, which is done by organelles. The cell membrane is mainly responsible for entry and exit of materials, cell interaction, stimulus response, and protection.
Step-by-step explanation:
The functions of cell membranes include several critical roles but the correct answer to the question - functions of cell membranes include all but which of the following - is the providing different compartments within the cell that may carry on different activities. Cell membranes are mainly involved in determining what can enter or leave a cell, interacting with other cells, responding to stimuli, and protecting the cell from damage. The role of providing compartments within the cell is actually performed by internal membranes in the context of organelles. The cell membrane's selective permeability ensures that materials required by the cell can enter while harmful materials are kept out, playing a vital part in the survival and function of the cell. Additionally, the plasma membrane's flexibility allows cells like red blood cells and white blood cells to change shape as they move through capillaries. Markers on the surface of plasma membranes play a crucial role in cell recognition during tissue formation and the immune response.