During the Na/K pump cycle, the protein binds a molecule of ATP and soon after, the ATP is hydrolyzed and a phosphate is transferred to an amino acid in the pump's structure. What is the affinity of the pump for sodium and potassium ions at this point? Multiple choice question. High affinity for both sodium and potassium Low affinity for sodium and high affinity for potassium Low affinity for both sodium and potassium High affinity for sodium and low affinity for potassium
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Sodium Ion Transport. A marine protozoan is known to pump sodium ions outward by a simple ATP-driven $\mathrm{Na}^{+}$ pump that operates independently of potassium ions. The intracellular concentrations of ATP, ADP, and $P_{1}$ are $20,2,$ and $1 \mathrm{mM}$ respectively, and the membrane potential is $-75 \mathrm{mV}$ (a) Assuming that the pump transports three sodium ions outward per molecule of ATP hydrolyzed, what is the lowest internal sodium ion concentration that can be maintained at $25^{\circ} \mathrm{C}$ when the external sodium ion concentration is $150 \mathrm{mM}$ ? (b) If you were dealing with an uncharged molecule rather than an ion, would your answer for part a be higher or lower, assuming all other conditions remained the same? Explain.
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One transport protein we'll come back to multiple times in the course is the sodium-potassium pump. What happens as a result of the action of the sodium-potassium pump? Choose both correct answers. Sodium and potassium ions move across the membrane passively down their gradient. There is potential energy in an ion gradient across the membrane that can be used to drive other processes. Sodium and potassium ions are at highest concentration outside the membrane. An electrochemical gradient is established across the membrane. ATP is synthesized from ADP and inoragnic phosphate.
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