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cholesterol; keep membrane fluid
molecules that are buried in the membrane; only found in animal cell membranes
holds cell's contents together, identifies the cell, controls what enters/leaves the cell
3 roles of the plasma membrane
the movement of a substance from an area of high concentration to an area of lower concentration caused by the random motion of particles of the substance
a protein that actively transports sodium ions and potassium ions against their concentration gradient
the transport of a substance across the cell membrane against its concentration gradient
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