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movement of an ion across a membrane by passive diffusion?
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Which of the following statements is true about the net movement of an ion across a membrane by passive diffusion through a membrane channel?

a) The charge on the other side of the membrane is generally the opposite of the ion's charge.
b) The cell expends energy as the ion passes through the membrane.
c) For every ion that diffuses through the membrane, a different ion diffuses in the opposite direction.
d) There is a higher concentration of ions on the side of the membrane toward which the ion diffuses.

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