Which of the following is typical of carrier mediated facilitated diffusion?
A) it couples the movement of one molecule against the concentration gradient to the movement of another molecule down the gradient
B) it uses permanent pores in the membrane to move molecules in and out of the cells
C) it accelerates a process that is already energetically favorable
D) it uses intrinsic ATPase activity of carrier proteins to bring needed substance into the cell
Correct Answer:
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