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If it's an animal cell, it's cell membrane. If it's a plant cell, it's cell wall. The cellular membrane is made up of various proteins found in a fluid of phospholipid molecules that create a bilayer The bilayer is formed when the polar water molecules repel the non-polar tails of the phospholipids causing them to stack up and form a non-polar interior. The non polar of the interior impedes the passage of water soluble substances. The bilayer sheets contain other proteins that serve various functions to allow passage in and out of the cell and help make up the membrane.

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9y ago
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7y ago

The Cell Membrane
If it's an animal cell, it's cell membrane. If it's a plant cell, it's cell wall. The cellular membrane is made up of various proteins found in a fluid of phospholipid molecules that create a bilayer The bilayer is formed when the polar water molecules repel the non-polar tails of the phospholipids causing them to stack up and form a non-polar interior. The non polar of the interior impedes the passage of water soluble substances. The bilayer sheets contain other proteins that serve various functions to allow passage in and out of the cell and help make up the membrane.

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11y ago

In plant cells the outer boundary is the cell wall. In all cells, what regulates what goes in is the cell membrane. Animal cells have no cell wall, just a cell membrane

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11y ago

Cell membrane

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Q: What Structures serves as the cells outer boundary and regulates what goes in?
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Which organelle is the boundary that regulates what comes in and out of the cells?

The cell membrane in animal cells. The cell wall in plant cells.


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