Which of the following is NOT a function of the cell membrane?

The function of generating energy for the cell is primarily the role of organelles such as mitochondria and chloroplasts, not the cell membrane. The cell membrane is crucial for maintaining the integrity of the cell by acting as a barrier and selectively allowing substances to enter or exit, thus regulating the internal environment. It also provides structural support by maintaining the shape of the cell and facilitating communication by allowing cells to send and receive signals through receptors embedded in the membrane. Energy generation, meanwhile, involves biochemical processes within specific organelles rather than the membrane itself, which is why this function is not attributed to the cell membrane.