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
You might also like to view...
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
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
The process of filtration in the glomerulus is
driven by a. active transport. b. blood pressure. c. osmosis. d. dialysis. e. sodium-potassium pumps
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.