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Biologly Chapter 5.1

Biologly Chapter 5

TermDefinition
Passive Transport The movement of substances across a cell membrane without the use of energy by the cell.
Diffusion The movement of particles from regions of higher density to regions of lower density.
Concentration Gradient A difference in the concentration of a substance across a distance.
Equilibrium In biology, a state that exists when concentration of a substance is the same throughout a space.
Osmosis The diffusion of water or another solvent from a more dilute solution (of a solute) to a more concentrated solution (of a solute) through a membrane that is permeable to the solvent.
Hypotonic Describes a solution whose solute concentration is lower than the solute concentration inside the cell.
Hypertonic Describes a solution whose solute concentration is higher than the solute concentration inside a cell.
Isotonic Describes a solution whose solute concentration is equal to the solute concentration inside a cell.
contractile Vacuole In protists, an organelle that accumulates water an then releases it periodically to maintain osmotic pressure.
Turgor Pressure The pressure that is exerted on the inside of cell walls and that is caused by the movement of water into the cell.
Plasmolysis The contraction or shrining of the cell membrane of a plant cell in a hypertonic solution in response to the loss of water by osmosis.
Cytolysis The bursting of a cell.
Facilitated Diffusion The transport of substances through a cell membrane along a concentration gradient with the aid of carrier proteins.
Carrier Protein A protein that transports substances across a cell membrane.
Ion Channel A complex of protein molecules in a cell membrane that form a pore through which ions can pass.
Created by: DragonT20