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Diffusion and Osmosis Lab Exam With Complete Solutions
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Diffusion and Osmosis Lab Exam WithComplete Solutions
Solute Matter that is dissolved in solution.
Solvent In solution, the matter in which the solute dissolves.
Solution A homogenous mixture formed when one substance (the solvent) dissolves
another (the solute).
Selective permeability The structural property of a plasma membrane that allows some
substances to cross more easily than others.
Passive transport, Net movement of molecules across a cell membrane from an area of
high concentration to one of low concentration
Diffusion - ANSWER Movement of molecules from high to low concentration, passively
Facilitated diffusion - ANSWER Passive transport of specific molecules across a
membrane, down their concentration gradient, aided by transport proteins.
Osmosis - ANSWER The diffusion of water across a selectively permeable membrane.
Tonicity The relative ability of a solution to cause a cell to gain or lose water by differing
in the concentration of non-penetrating solutes; it requires no movement of solutes.
Isotonic solution A solution that does not change the shape of a cell because its
concentration of water and solutes equals that of the cell.
hypotonic solution SOLUTION A solution whose solute concentration is less than that
inside the cell, such that there is a net flow of water into the cell.
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