Which is true about mediated transport across cell membranes?
A. As the concentration gradient across a membrane increases, the transport rate always increases.
B. It refers both to simple diffusion and to the active transport of molecules.
C. It is nonspecific; any transporter can transport any molecule across the cell membrane.
D. It is characterized by saturable carriers and a maximum velocity of transport.
E. It refers to the movement of ions through protein channels.
Answer: D
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