Question

HELP ASAP!!

During diffusion, when the concentration of molecules on both sides of a membrane is the same, the molecules will
A. continue to move across the membrane in both directions evenly
B. move across the membrane to the outside of the cell. C. move across the membrane to the inside of the cell.
D. stop moving across the membrane. ​

Answer 1

During diffusion, when the concentration of molecules on both sides of a membrane is the same, the molecules will continue to move across the membrane in both directions evenly. The correct answer is option A.

Step-by-step explanation:

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration until equilibrium is reached. At equilibrium, there is no longer a concentration gradient, and molecules flow equally in both directions across the membrane. During diffusion, when the concentration of molecules on both sides of a membrane is the same, the molecules will A. continue to move across the membrane in both directions evenly.

For example, if you have a container with water and a solute, and the concentration of the solute on both sides of a semipermeable membrane is the same, the solute will still move across the membrane in both directions, even though there is no net movement of molecules.