Biology - Cell Transport and Membrane Structure

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concentration

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a measure of how much of a given substance is mixed with another substance

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diffusion

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passive transport of solute from high to low concentration

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equilibrium

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means there is a balance of solute/solvent in a solution both inside and outside of a cell; passive transport occurs until this is reached

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osmosis

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passive transport of water from high to low concentration

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semipermeable membrane

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a membrane that allows certain substances to pass through but does not allow the passage of other materials

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solute

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a substance that is dissolved in another substance to form a solution

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solvent

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a liquid that dissolves a solute to form a solution; most often water in biology

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phosphate

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PO4 = a group consisting of a phosphorus and 4 oxygen molecules that makes up the hydrophilic portion of a cell membrane

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hypotonic

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a solution that contains less solute (more solvent) than a solution to which it is compared

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hypertonic

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a solution that contains more solute (less solvent) than a solution to which it is compared