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The semi-permeable part of the cell would be the cell membrane, which allows some molecules (water, in particular) to pass freely through but restricts the movement of other molecules (such as proteins and enzymes).

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10y ago
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12y ago

That would be an Osmotic membrane. Such membranes primarily control water passing in and out of cells, though they do permit passage of certain chemicals and nutrients if the molecular size is smaller than a water molecule.

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12y ago
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7y ago

cell membrane

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Q: What is a semi-permeable material that controls the movement of materials in and out of a cell?
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