5 Written questions
5 Matching questions
- facilitated diffusion
- contractile vacuole
- ion channel
- a a complex of protein molecules in a cell membrane that form a pore through which ions can pass.
- b the transport of substances through a cell membrane along a concentration gradient with the aid of carrier proteins.
- c in protists, an organelle that accumulates water and then releases it periodically to maintain osmotic pressure.
- d 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.
- e the movement of particles from regions of higher density to regions of lower density.
5 Multiple choice questions
- describes a solution whose concentration is equal to the solute concentration inside a cell.
- the movement of substances across a cell membrane without the use of energy by the cell.
- the pressure that is exerted on the inside of cell walls and that is caused by the movement of water into the cell.
- a cell that ingests and destroys (digests) foreign matter or microorganisms.
- the movement of chemical substances, usually across the cell membrane, against a concentration gradient; requires cells to use energy.
5 True/False questions
endocytosis → the process by which a cell membranes surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell.
sodium-potassium pump → a carrier protein that uses ATP to actively transport sodium ions out of a cell and potassium ions into the cell.
phagocytosis → the process by which a cell engulfs large particles or whole cells, either as a defense mechanism or as a means to obtain food.
exocytosis → the process by which a cell membranes surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell.
concentration gradient → a difference in the concentration of a substance across a distance.