What is plasma membrane
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microscopic membrane of lipids and proteins which forms the external boundary of the cytoplasm of a cell or encloses a vacuole, and regulates the passage of molecules in and out of the cytoplasm.
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The plasma membrane is selectively permeable. This means it allows some molecules to enter while keeping others out. An example of this can be seen in examining water and calcium in the cell. Water molecules are allowed to freely enter cells through the plasma membrane.
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