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5 Written questions

5 Matching questions

  1. facilitated diffusion
  2. contractile vacuole
  3. diffusion
  4. ion channel
  5. osmosis
  1. a a complex of protein molecules in a cell membrane that form a pore through which ions can pass.
  2. b the transport of substances through a cell membrane along a concentration gradient with the aid of carrier proteins.
  3. c in protists, an organelle that accumulates water and then releases it periodically to maintain osmotic pressure.
  4. 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.
  5. e the movement of particles from regions of higher density to regions of lower density.

5 Multiple choice questions

  1. describes a solution whose concentration is equal to the solute concentration inside a cell.
  2. the movement of substances across a cell membrane without the use of energy by the cell.
  3. the pressure that is exerted on the inside of cell walls and that is caused by the movement of water into the cell.
  4. a cell that ingests and destroys (digests) foreign matter or microorganisms.
  5. the movement of chemical substances, usually across the cell membrane, against a concentration gradient; requires cells to use energy.

5 True/False questions

  1. endocytosisthe process by which a cell membranes surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell.

          

  2. sodium-potassium pumpa carrier protein that uses ATP to actively transport sodium ions out of a cell and potassium ions into the cell.

          

  3. phagocytosisthe process by which a cell engulfs large particles or whole cells, either as a defense mechanism or as a means to obtain food.

          

  4. exocytosisthe process by which a cell membranes surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell.

          

  5. concentration gradienta difference in the concentration of a substance across a distance.

          

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