The cell membrane only lets some molecules in and out because it is living. semi-permeable. flexible. non-permeable.

asked Aug 17, 2017 150k views

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by MZD

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Semi permeable
Semi meaning like some and permeable is like pass through so some pass through.

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the cell membrane is semi-permeable, kind of like a filter to let some molecules in and keep larger molecules out

Dratewka answered Aug 21, 2017

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