Which of the following statements is correct about diffusion?
A)
It is very rapid over long distances.
B)
It requires an expenditure of energy by the cell.
C)
It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.
D)
It is an active process in which molecules move from a region of lower concentration to one of higher concentration.
E)
It requires integral proteins in the cell membrane.
Answer: C