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Answer to Question #57829 in Cell Biology for tracy guido

Question #57829
select the descriptions that apply to the sodium potassium pump
adenosine triphosphate is necessary for the pump’s function
the pump moves potassium ions into the cell and sodium out of the cell
sodium ions and potassium ions move into and out of the plasma membrane by osmosis
the concentration gradient of the ions determines the direction of movement through the pump
Expert's answer
1. adenosine triphosphate is necessary for the pump’s function.
2. the pump moves potassium ions into the cell and sodium out of the cell
They are true because ATP is used for conformational changes of the pump and each time three sodium ions are removed from the cell and two potassium ions are carrued to the cell.
The other two statements are not true because only water can move by osmosis, not ions. And ions move against their concentration gradient thus it does not affect the directions of their movement.

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