45- Concentration gradient refers to: (a) Change of concentration with respect to time (b) Change of concentration with respect to space (c) Change of concentration with respect to temperature (d) None of the mentioned 48- Generally, the metal-to-metal diffusion takes place by vacancy diffusion. (a) True (b) False 49- Rate of solid-state diffusion does not depend on which of the following? (a) Temperature (b) Diffusing species (c) Host solid d) Gravity 52- In steady state diffusion which of the following remains constant? (a) Concentration gradient (b) Kinetic energy of particles (c) Potential energy of particles (d) Change of concentration with respect to temperature 53- Which of the following law is used for steady state conditions to obtain the diffusion? (a) Fick's law (b) Newton's law of diffusion (c) Bragg's law (d) Charles's law
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The driving force for assimilate transport is: a. diffusion. b. active transport. c. transpiration. d. pressure-flow. 2. Which of the following is the best definition of osmosis? a. The net movement of glucose across a selectively permeable membrane. b. The net movement of any substance down a solute concentration gradient. c. The net movement of water from a region of high water potential to a region of low water potential. d. The net movement of water from a region of low water potential to a region of high water potential. 4. Fill in the blanks: The driving force of diffusion is _________, that of osmosis is __________ and that of bulk flow is __________ a. water potential gradient; concentration gradient; pressure gradient b. concentration gradient; pressure gradient; water potential gradient c. concentration gradient; water potential gradient; pressure gradient d. water potential gradient; pressure gradient; concentration gradient
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27. The free energy change for moving ions across a membrane depends on the concentration of the ion on each side of the membrane, membrane potential, and the ABC transporter: a, b, and c. 28. The energy for secondary active transport comes directly from the secondary active transporter hydrolyzing ATP. True or False. 29. Primary active transport is driven through harnessing the energy within a concentration gradient and/or electrochemical gradient. True or False.
In cotransport (indirect active transport) (a) a uniporter moves a solute across a membrane against its concentration gradient (b) the movement of one solute down its concentration gradient provides energy for transport of some other solute up its concentration gradient (c) a channel protein moves ions by facilitated diffusion (d) osmosis powers the movement of ions against their concentration gradient (e) sodium is directly transported in one direction, and potassium is indirectly transported in the same direction
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