Plasma membrane - The phospholipid bilayer and embedded proteins which separate the intracellular environment from the extracellular environment., Selective permeability - A property of cell membranes that ensures only specific substances pass across them., passive transport  Passive transport  - The movement of molecules down the concentration gradient, without an input of energy, Active transport - Movement of molecules across a semipermeable membrane that requires energy, Diffusion - The passive movement of molecules from areas of high concentration to areas of low concentration, Hydrophobic - Having a tendency to repel from and be insoluble in water, Hydrophilic - Having a tendency to be attracted to and dissolve in water, Facilitated Diffusion - A type of passive transport where molecules move through a phospholipid bilayer with the aid of a membrane protein, Osmosis - The passive transport of water through a semipermeable membrane, Hypertonic - Describes a solution with a higher solute concentration when compared to another solution, Hypotonic - Describes a solution with a lower solute concentration when compared to another solution, Isotonic - Describes a solution with the same solute concentration as another solution, Turgid - Describes plant cells that are swollen and firm from water uptake, Plasmolysis - Describes plant cells with weak and sagging plasma membranes from water loss, Lysis - Cause a cell plasma membrane to burst or break,

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