6. The Membrane
Simple and Facilitated Diffusion
Multiple Choice
Multiple ChoiceWhich of the following statements about diffusion is true?
A
It involves only the movement of water molecules.
B
It requires expenditure of energy by the cell.
C
It occurs when molecules move from a region of lower concentration to a region of higher concentration.
D
It always requires integral proteins of the cell membrane.
E
It is a passive process.
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