Question

Diffusion, movement of particles across a membrane is driven by differences in

a. concentration.
b. shape.
c. force.
d. size.

Answer 1

Diffusion is the movement of particles from a higher concentration of water, (less solute) to a lower concentration of water (high solute). The reverse process is not applicable, always from a higher to a lower one. It moves across the membrane through differences in concentration. So the answer is letter A.