Question

unit 1 cumulative test (characteristics of life, biomolecules, cell structure and transport) 202
33 of 42
possible points: 2.18
diffusion is the movement of molecules from
an area of low concentration to an area of high concentration
an area of high concentration to an area of low concentration
an area of equilibrium to an area of high concentration
all of the above

Explanation:

Diffusion is a passive transport process where molecules move down their concentration gradient. This means they move from a region where their concentration is high (more molecules) to a region where their concentration is low (fewer molecules) until equilibrium is reached. The first option describes movement against the concentration gradient (which is active transport, not diffusion). The third option is incorrect because at equilibrium, there is no net movement, and diffusion doesn't move from equilibrium to high concentration. So the correct description of diffusion is movement from high to low concentration.

Answer:

B. an area of high concentration to an area of low concentration