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Definition
| protein that transports specific substances across a biological membrane |
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Definition
| difference in concentration of a substance across space |
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| organelle in protists that expels water |
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| process by which molecules move from an area of higher concentration to an area of lower concentration |
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| state that exists when the concentration of a substance is the same throughout a space |
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Definition
| process in which substances move down their concentration gradient across the cell membrane with the assistance of carrier proteins |
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| describing a solution whose solute concentration is higher than that inside a cell |
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| describing a solution whose solute concentration is lower than that inside a cell |
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| membrane protein that provides a passageway across the cell membrane through which an ion can diffuse |
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Definition
| describing a solution whose solute concentration equals that inside a cell |
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| diffusion of water across a selectively permeable membrane |
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Definition
| movement of substances across a cell membrane without the use of cell energy |
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Definition
| shrinking or wilting of a walled cell in a hypertoneic environment |
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Definition
| water pressure within a plant cell |
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| movement of a substance across a cell membrane against a concentration gradient; requires the cell to expend energy |
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| process by which a cell surrounds and engulfs substances |
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| process by which a vesicle inside a cell fuses with the cell membrane and releases its contents to the external environment |
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| cell that engages in phagocytosis |
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Definition
| type of endocytosis in which a cell engulfs large particles or whole cells |
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Definition
| type of endocytosis in which a cell engulfs solutes or fluids |
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Definition
| carrier protein that actively transports K+ ions into and Na+ out of cells |
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Definition
| membrane-bound sac in a eukaryotic cell that contains materials involved in endocytosis, exocytosis, or transport within the cell |
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