Question

What is the main function of the cell membrane in a plant cell?
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to control which substances enter and leave the cell
to break down sugar and release energy that the cell can use
to give the cell its fixed shape
to use energy from sunlight to make sugar

Answer 1

to control which substances enter and leave the cell

The cell (plasma) membrane is selectively permeable, regulating the movement of ions, nutrients and wastes into and out of the cell. (The other choices describe mitochondria, the cell wall, and chloroplasts.)