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| a lipid that contains phosphorus and that is a structural component in cell membranes |
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| the basic structure of a biological membrane, composed of two layers of phospholipids |
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| in biology, a state that exists when the concentration of a substance is the same throughout a space |
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| a difference in the concentration of a substance across a distance |
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Definition
| the movement of particles from regions of higher density to regions of lower density |
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| the diffusion of water or another solvent from a more dilute solution (of a solute) to a more concentrated solution (of the solute) through a membrane that is permeable to the solvent |
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| a carrier protein that uses ATP to actively transport sodium ions out of a cell and potassium ions into the cell |
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| anything that serves to direct, guide, or warn |
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Definition
| a protein that binds specific signal molecules, which causes the cell to respond |
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