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Anonymous
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The Steel Barred Door. O.K. I'm sorry, i have an impulse control problem and the second i saw your question that answer hit me, with a little devil on one shoulder saying "do it" and eminem on the other saying "do worse". anyway, here's a real answer to what i think you are asking about. Cell Membranes the Cell membrane is like a plastic bag We have been talking about cells being a unit of organization in biology. Let's look at the cell membrane and see how that membrane keeps all of the pieces inside. When you think about a membrane, imagine it is like a big plastic bag with some tiny holes. That bag holds all of the cell pieces and fluids inside the cell and keeps any nasty things outside the cell. The holes are there to let some things move in and out of the cell. to be continued at: http://www.biology4kids.com/files/cell_membrane.html
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