Which of the following statements is correct about simple diffusion?
A. It requires an expenditure of energy by the cell.
B. Is is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.
C. Is is an active process in which molecules move from a region of lower concentration to on of higher concentration.
D. It may require a transport protein.
E. It involves movement of molecules down a concentration gradient and may require a transport protein.
Answer: B. Is is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.
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