A) diffusion
B) metabolic energy
C) electrochemical gradient
D) both [b] & [c].
Correct Answer: D
Solution :
: Active transport is the transportation or movement of a substance across the cell membrane (plasma membrane which is selectively permeable membrane) against the concentration gradient by using metabolic energy. This implies movement of molecules from areas of low to areas of high concentration. Electrochemical gradient gives the plasma membrane its electrical potential.
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