For charged particles, transport across the cell membrane is influenced by the concentration gradient and ____

a. the size of the particle
b. pore size
c. electrical gradient
d. ATP production


e. membrane thickness


ANSWER: c

Biology & Microbiology

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Because it has no aquaporins, water is generally trapped in the ____ in mammals

a. distal convoluted tubule b. Bowman's capsule c. descending segment of the loop of Henle d. proximal convoluted tubule e. ascending segment of the loop of Henle

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Transport of photosynthetically produced sugars from leaves to roots occurs by _____

a. pressure flow b. differences in source and sink solute concentrations c. the pumping force of xylem vessels d. transpiration, tension, and cohesion of water e. pressure flow and differences in source and sink solute concentrations

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The process of filtration in the glomerulus is

driven by a. active transport. b. blood pressure. c. osmosis. d. dialysis. e. sodium-potassium pumps

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The global pattern of air circulation begins at

a. the equator. b. 30 degrees north latitude. c. 30 degrees south latitude. d. 60 degrees north latitude. e. 60 degrees south latitude.

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