Question

A molecule is present at two different concentrations on either side of a membrane. The molecule will have the greatest diffusion rate if the concentration is _______ mM on one side and _______ mM on the other.

a. 10; 10
b. 5; 10
c. 15; 5
d. 20; 15

Answer 1

The molecule will diffuse at the greatest rate when the concentration is 10 mM on one side and 5 mM on the other.

Step-by-step explanation:

The molecule will have the greatest diffusion rate if the concentration is 10 mM on one side and 5 mM on the other.

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration in order to equalize the concentration gradient. The rate of diffusion is influenced by the steepness and extent of the concentration gradient, as well as the mass of the molecules diffusing. The greater the difference in concentration, the more rapid the diffusion.

Therefore, the concentration of the molecule should be higher on one side (10 mM) and lower on the other side (5 mM) in order to create a steep concentration gradient and maximize the diffusion rate.