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What prevents ions from crossing the plasma membrane via
simple diffusion?
A. Ions are too large.
B. Ions carry a charge.
C. Ions are hydrophobic.
D. Ions do not produce a concentration difference.
E. Ions cannot interact with membrane-bound
proteins.

Sagot :

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Simple diffusion is the concept of a substance moving from an area of high concentration to a lower concentration without energy input. Because the plasma membrane is made of lipids which are non-polar, this membrane readily allows non-polar substances to diffuse through easily. If a substance has a charge like that of an ion, it will be difficult for the ion to cross the plasma membrane through simple diffusion. The answer should be B. 
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