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9 September, 21:15

The diagram shows sodium ions and potassium ions moving against their concentration gradients to cross the plasma membrane. Which statement best describes how this movement is possible? Question 4 options: The ions move across the semipermeable membrane through simple diffusion. ATP provides the energy required to move the ions across the plasma membrane by active transport. Water moves across the plasma membrane by osmosis and carries the ions with it.

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  1. 9 September, 21:37
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    I think the correct answer from the choices listed above is the first option. The movement of sodium ions and potassium ions moving against their concentration gradients to cross the plasma membrane can be described by simple diffusion where the driving force is concentration gradient. Hope this answers the question.
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