Compare and contrast how a molecule would cross the plasma membrane by simple diffusion to the mechanism of how a different molecule would cross by facilitated diffusion via channels. Include in your answer (a) descriptions of the chemical structure of the plasma membrane, (b)how the chemical properties of a substance explain why some substances can cross by simple diffusion and other substances require the assistance of proteins and (c) the types of forces that can act to drive substances across the membrane. Explain how channels can be selective to what substances pass through them and what commonly moves via channels.

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