Question

Which of the following statements about diffusion is true?

A) Diffusion requires a membrane
B) Diffusion moves substances against the concentration gradient
C) Diffusion is an active transport process
D) Diffusion is the movement of molecules from high to low concentration

Answer 1

Diffusion is the movement of molecules from high to low concentration.

Step-by-step explanation:

Diffusion is the movement of molecules from high to low concentration. This statement is true. Diffusion is a passive transport process, meaning it does not require the input of energy. It occurs when molecules move down their concentration gradient, from an area of high concentration to an area of low concentration. A simple example of diffusion is the movement of oxygen molecules from the air sacs in the lungs into the bloodstream.