Diffusion requires:
A) a semipermeable membrane.
B) a concentration gradient.
C) ions.
D) none of the above.

Question

Quizplus · Accepted Answer

Diffusion requires a concentration gradient, as this is what drives the movement of particles from an area of high concentration to an area of low concentration. A semipermeable membrane may facilitate diffusion, but it is not required for the process to occur. Ions may be involved in diffusion, but they are not necessary for the process to occur. Therefore, the correct answer is B, a concentration gradient.

Diffusion Requires