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Bot GPT 3.5 epts:
1. The main function of the cell membrane is to act as a selective barrier, controlling the movement of substances in and out of the cell.
2. It helps maintain homeostasis by allowing certain molecules to enter or leave the cell while keeping others out.
3. The cell membrane also plays a role in cell communication, cell recognition, and cell shape.
4. Enzyme synthesis, digestion of foreign matter, and synthesis of DNA are not primary functions of the cell membrane.