5 Written Questions
5 Matching Questions
- sodium-potassium pump
- turgor pressure
- a a small cavity or sac that contains materials in a eukaryotic cell; forms when part of the cell membrane surrounds the materials to be taken into the cell or transported within the cell.
- b describes a solution whose solute concentration is lower than the solute concentration inside a cell.
- c the movement of particles from regions of higher density to regions of lower density.
- d a carrier protein that uses ATP to actively transport sodium ions out of a cell and potassium ions into the cell.
- e the pressure that is exerted on the inside of cell walls and that is caused by the movement of water into the cell.
5 Multiple Choice Questions
- the transport of substances through a cell membrane along a concentration gradient with the aid of carrier proteins.
- in biology, a state that exists when the concentration of a substance is the same throughout a space.
- a complex of protein molecules in a cell membrane that form a pore through which ions can pass.
- the bursting of a cell.
- the diffusion of water or another solvent from a more dilute solution (of a solute) to a more concentrated (of the solute) through a membrane that is permeable to the solvent.
5 True/False Questions
pinocytosis → a method of active transport across the cell membrane in which the cell takes in extracellular fluids.
passive transport → the movement of chemical substances, usually across the cell membrane, against a concentration gradient; requires cells to use energy.
concentration gradient → a difference in the concentration of a substance across a distance.
plasmolysis → the contraction or shrinking of the cell membrane of a plant cell in a hypertonic solution in response to the loss of water by osmosis.
contractile vacuole → in protists, an organelle that accumulates water and then releases it periodically to maintain osmotic pressure.