Microbiology 9th Edition by Laura Black, Jacquelyn Black

Exercise 17

Match the following mechanisms by which substances move across membranes to their descriptive terms:
(a) Diffusion in which water molecules diffuse across a se lectively permeable membrane
(b) Movement of substances down a concentration gradient with no expenditure of energy
(c) Passive diffusion down a concentration gradient and across a membrane with the aid of special pores or carrier molecules
(d) Fluid environment surrounding cells that contains a higher concentration of a dissolved substance, causing cells to shrink
(e) Fluid environment surrounding cells that contains a lower concentration of a dissolved substance, causing cells to burst
(f) Requires ATP energy to move molecules and ions against their concentration gradient
(g) Net movement of particles from a region of higher to lower concentration
(h) Fluid environment surrounding cells that contains an equal concentration of a dissolved substance, causing no change in cell volume