Which decreases the rate of diffusion for a substance through a membrane?
A) increasing the concentration gradient.
B) increasing the molecular weight of the substance.
C) increasing the permeability of the membrane.
D) increasing the surface area of the membrane.
E) opening the channels in the membrane.

Question

Quizplus · Accepted Answer

Increasing the molecular weight of the substance will decrease the rate of diffusion because it will increase the size and mass of the molecule, making it more difficult for it to pass through the membrane. The other choices would all increase the rate of diffusion in some way.

Which Decreases the Rate of Diffusion for a Substance Through