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| The thin core ring (covering) that forms the outer boundry of the cell |
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| Tiny organelles that direct ribosomes |
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| Perform many functions for a cell to stay alive |
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| requires the cell to use its own energy |
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| Movement of molecules from a place where there are many of them to a place where their are few |
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| The movement of substances through a membrane without cells energy |
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| Certain molecules can go through them some cant |
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