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Bench Mark 1 review. Cell membrane. The cell membrane is a very important organelle. It acts as a barrier to the outside and protects the cell. It also allows substances to enter and exit the cell. Phospholipid . Phospholipid Polar and non-polar.
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Cell membrane The cell membrane is a very important organelle. It acts as a barrier to the outside and protects the cell. It also allows substances to enter and exit the cell.
Phospholipid Phospholipid Polar and non-polar