A) active transport occurs more rapidly than passive
B) passive transport is non-selective
C) passive transport is confined to anions and cations
D) passive transport requires a concentration gradient across the membrane, whereas active transport requires metabolic energy
Correct Answer: D
Solution :
Concentration gradient means difference in concentration of solutions present both the sides of plasma membrane. Passive transport always flows from high concentration of solution to lower concentration of solution. Active transport requires energy expenditure.
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