Each of the following is a characteristic of active transport mechanisms except
A) sensitivity to inhibitors such as proton pump inhibitors.
B) nondirectionality for moving a solute in either direction across a membrane depending on the solute concentration gradient.
C) coupling transport of a solute down its concentration with transport of another solute up its concentration gradient via a symport or antiport mechanism..
D) moving solutes away from equilibrium across a membrane.
E) coupling a thermodynamically unfavorable (endergonic) process with a favorable (exergonic) process.
Answer: B
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