Which is true regarding the mediated transport of a substance across a plasma membrane?
A. It always increases in direct proportion to the increasing concentration of the substance on one side of the membrane.
B. Both "depends upon the binding of that substance to a specific site on the membrane protein" and "depends upon movement of proteins from one side of the membrane to the other" are correct.
C. It depends upon movement of proteins from one side of the membrane to the other.
D. It depends upon the binding of that substance to a specific site on the membrane protein.
E. All of the choices are correct.
Answer: D
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