Which of the following statements is correct about diffusion?
A) It may require a transport protein.
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 involves movement of molecules down a concentration gradient and may require a transport protein.
E) It is an active process in which molecules move from a region of lower concentration to one of higher concentration.

Question

Quizplus · Accepted Answer

Diffusion involves movement of molecules down a concentration gradient from a region of higher concentration to a region of lower concentration, and in some cases, it may require a transport protein. However, it is a passive process that does not require any expenditure of energy by the cell. Option A may be true in some cases, but not always, and option B and E are incorrect as they describe active processes, which are not involved in diffusion.

Which of the Following Statements Is Correct About Diffusion