What is the basic difference between simple diffusion and facilitated diffusion across a cell membrane?
A) In simple diffusion, molecules move down the concentration gradient but in facilitated diffusion molecules move up the concentration gradient.
B) In facilitated diffusion, molecules only move with the aid of a protein in the membrane.
C) Simple diffusion requires molecules to move through special doorways in the cell membrane.
D) Simple diffusion is passive but facilitated diffusion is an active process that uses energy.
Ans: B) In facilitated diffusion, molecules only move with the aid of a protein in the membrane.
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