What is diffusion? - ProProfs
     

What is diffusion?

A. The movement of molecules through a semi-permeable membrane from an area of lower concentration to an area of higher concentration
B. The movement of molecules through a semi-permeable membrane from an area of higher concentration to an area of lower concentration
C. The movement of molecules across a semi-permeable membrane until there are equal amounts on each side of the membrane
D. Molecules desire to spread as far from a membrane as possible


This question is part of Diffusion and Osmosis

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2 Answers

John Adney

John Adney

Answered on Oct 24, 2017

diffusion does not need to occur across a semi permeable membrane that is osmosis and active transport but not diffusion in general

RickiHeicklen

RickiHeicklen

Answered on Sep 20, 2017

(B) The movement of molecules through a semi-permeable membrane from an area of higher concentration to an area of lower concentration

The correct answer is The movement of molecules from an area of higher concentration to an area of lower concentration because diffusion is specifically trying to equalize the percentage, or concentration, of all substances in two areas. Therefore, molecules move from a higher concentration to a lower concentration to try to balance the two out.

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