A) \[3N{{a}^{+}}\]into and\[2{{K}^{+}}\]out of cell
B) \[2N{{a}^{+}}\]into and\[2{{K}^{+}}\]out of cell
C) \[3N{{a}^{+}}\]out of and\[3{{K}^{+}}\]into cell
D) \[3N{{a}^{+}}\] out and\[2{{K}^{+}}\]into cell.
Correct Answer: D
Solution :
: Sodium potassium exchange pump is an example of primary active transport. For each molecule of ATP used, three\[N{{a}^{+}}\]ions are pumped out and two\[{{K}^{+}}\]ions are pumped in. The \[N{{a}^{+}}\]gradient established by the \[N{{a}^{+}}-{{K}^{+}}\]pump provides a source of energy that is frequently used to power the active transport of sugars, amino acids and ions in mammalian cells.
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