Question

Why do concentration gradients exist?

A.To differentiate the organelles from the molecules.
B. To contrast between the high and low concentration of molecules.
C. For cells to reach exocytosis
D. For molecules to undergo facilitated diffusion.

Answer 1

B. To contrast between the high and low concentration of molecules.

for example a solution with a higher solute concentration than the inside of the cell is called hypertonic