why do Plasma membranes have desou pluve permeable,
membranes.
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The cell membrane is selectively permeable, allowing only a limited number of materials to diffuse through its lipid bilayer. All materials that cross the membrane do so using passive (non energy-requiring) or active (energy-requiring) transport processes.
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Plasma membranes are selectively permeable (or semi-permeable), meaning that only certain molecules can pass through them. ... Generally, ions (e.g. sodium, potassium) and polar molecules cannot pass through the membrane; they must go through specific channels or pores in the membrane instead of freely diffusing through.
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