Which of the following is necessary for simple diffusion to take place?
A)a concentration gradient
B)a selectively permeable membrane
C)a hypertonic solution
D)cellular energy
E)all of the choices are correct

Question

Quizplus · Accepted Answer

A concentration gradient is necessary for simple diffusion to take place. Simple diffusion is the movement of substances from an area of high concentration to an area of low concentration, so there must be a concentration gradient for the movement to occur. A selectively permeable membrane can aid in the process, but it is not necessary. A hypertonic solution and cellular energy are not necessary for simple diffusion to occur.

Which of the Following Is Necessary for Simple Diffusion to Take