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OpenStudy (anonymous):
The cell membrane is made of phospholipids and is selectively permeable, or semipermeable. Which major theme in biology does this statement represent
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OpenStudy (anonymous):
Selectively permeable is NOT the same as semi-permeable. A piece of dialysis tubing is semi-permeable; some solutes go though depending on their size. A CELL MEMBRANE is selectively permeable because its permeability changes from time to time, depending on the cell's needs. it SELECTS what it is permeable to...
OpenStudy (anonymous):
Exchange or transportation of substances across membranes ?
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