Final answer:
The cell membrane in a eukaryotic cell functions by regulating the movement of substances in and out of the cell through various transport mechanisms.
Explanation:
The function of the cell membrane in a eukaryotic cell is regulating the movement of substances in and out of the cell. The cell membrane acts as a selective barrier, allowing only certain molecules to pass through via various transport mechanisms such as passive diffusion, osmosis, active transport, endocytosis, exocytosis, and more.
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