A concentration gradient ceases to exist when
A)all the molecules have moved from high concentration to low.
B)the membrane pores close.
C)the temperature drops.
D)there is no net movement.
E)bulk flow intervenes.

Question

Quizplus · Accepted Answer

A concentration gradient ceases to exist when there is no net movement, meaning that the molecules are equally distributed on both sides of the membrane. This can either occur if all the molecules have moved from high concentration to low or if they have reached equilibrium without any further movement. The closure of membrane pores, temperature drop, and bulk flow may affect the rate or direction of movement, but they do not necessarily eliminate the concentration gradient itself.

A Concentration Gradient Ceases to Exist When