Allowing some substances to pass; permeable to smaller molecules but not to larger ones
The gradual difference in the concentration of solutes in a solution between two regions
A substance that is dissolved in a solution
The dissolving agent in a solution
The spontaneous movement of particles from where they are more concentrated to where they are less concentrated.
Occurs when two opposing processes proceed at the same rate (e.g. when the number of people ascending a slope on a ski lift = the number of people skiing down the slope).
The diffusion of water across a selectively permeable membrane.
Phrase used to describe the cell membrane. (See page 80).
The passage of a substance across a biological membrane down its concentration gradient, aided by specific transport proteins. (See page 82).
A solution having the same solute concentration as another solution. (See page 83).
In comparing two solutions, the one with the greater concentration of solutes. (See page 83)
In comparing two solutions, the one with the lower concentration of solutes. (See page 83)
The control of water balance. (See page 83)
The diffusion of a substance across a biological membrane, without any input of energy.
The movement of a substance across a biological membrane against its conentration gradient, aided by specific transport proteins and requiring input of energy (often as ATP).
Cellular "drinking"; a type of endocytosis in which the cell takes fluid and dissolved solutes into small membranous vesicles.
Cellular "eating"; a type of endocytosis whereby a cell engulfs macromolecules, other cells, or particles into its cytoplasm.
The movement of materials into the cytoplasm of a cell via membranous vesicles or vacuoles.
The movement of materials out of the cytoplasm of a cell via membranous vesicles or vacuoles.
Refers to the process in which the cell membrane pulls away from the cell wall as a plant cell loses water (p. 83).
Describes the tendency of a cell in a given solution to lose or gain water (p. 83).
Limp. Lacking in stiffness or firmness, as in a plant cell in surroundings where there is no tendency for water to enter the cell (p. 83).
Means "swollen or distended", especially by fluids, as in plant cells (p. 83).
Refers to the bursting of an animal cell when placed in an extremely hypotonic solution (p. 83).