AP Biology Module 11+12 Quiz
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15 Terms
Solute
A dissolved molecule such as the ions, amino acids, and sugars often found in a solvent such as water.
The amount of a solute in a volume of solution, expressed as moles of a solute per liter of solution. Also called molar concentration.
The net movement of a solvent, such as water, across a selectively permeable membrane toward the side of higher solute concentration.
Water potential
A parameter that combines all the physical and chemical factors that influence the movement of water, such as pressure, osmosis, and gravity; water moves from regions of higher to regions of lower.
The pressure needed to prevent water from moving from one solution into another by osmosis.
Tonicity
A measure of osmotic pressure; the higher the osmotic pressure, the higher this is.
Describes a solution having a higher solute concentration (lower water potential) than another solution.
Describes a solution having a lower solute concentration (higher water potential) than another solution.
Describes a solution having the same solute concentration (same water potential) as another solution.
An organelle in some protists that actively takes up and expels water that enters the cell by osmosis.
The effect of pressure in the movement of water.
The effect of solutes on the movement of water.
The regulation of water and solute levels to control osmotic pressure.
A close interaction that has evolved between species that live together, often interdependently.
A symbiosis in which one partner lives within the other.