5 Written questions
5 Matching questions
- carrier protein
- active transport
- a the movement of chemical substances, usually across the cell membrane, against a concentration gradient; requires cells to use energy.
- b in biology, a state that exists when the concentration of a substance is the same throughout a space.
- c describes a solution whose solute concentration is lower than the solute concentration inside a cell.
- d a protein that transports substances across a cell membrane.
- e 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 Multiple choice questions
- the movement of substances across a cell membrane without the use of energy by the cell.
- describes a solution whose concentration is equal to the solute concentration inside a cell.
- the pressure that is exerted on the inside of cell walls and that is caused by the movement of water into the cell.
- the movement of particles from regions of higher density to regions of lower density.
- 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.
5 True/False questions
vesicle → 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.
cytolysis → the bursting of a cell.
ion channel → a method of active transport across the cell membrane in which the cell takes in extracellular fluids.
contractile vacuole → in protists, an organelle that accumulates water and then releases it periodically to maintain osmotic pressure.
exocytosis → the process by which a substance is released from the cell through a vesicle that transports the substance to the cell surface and then fuses with the membrane to let the substance out.