The cell membrane: the gatekeeper
Why?
The cell membrane is a thin skin that controls what goes into and out of the cell.
Sugar and oxygen balls pass through doorways in a cell's membrane, while a big bacterium bumps against it and is kept out.
Press the button to see what the cell membrane lets in and keeps out.
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Waste carbon dioxide bubbles leave through the membrane like rubbish going out of a gate.
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Worked example
A cell needs oxygen and must get rid of carbon dioxide. Which way does each go through the membrane?