Which of the following best describes a type of transport where a membrane channel moves 3 Na out of the cell for every 2 K moved into the cell using ATP? Group of answer choices Simple diffusion Facilitated transport Active transport Passive transport
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The question mentions a membrane channel that moves 3 Na\(^+\) ions out of the cell and 2 K\(^+\) ions into the cell using ATP. Show more…
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Bryan V.
Active transport is the process in which a substance is transferred from a region of lower concentration to one of higher concentration. This is a nonspontaneous process and must be coupled to a spontaneous process, such as the hydrolysis of ATP. The concentrations of $K^{+}$ ions in the blood plasma and in nerve cells are $15 \mathrm{m} M$ and $400 \mathrm{m} M,$ respectively $\left(1 \mathrm{m} M=1 \times 10^{-3} \mathrm{M}\right) .$ Use Equation (17.13) to calculate $\Delta G$ for the process at the physiological temperature of $37^{\circ} \mathrm{C}:$ $\mathrm{K}^{+}(15 \mathrm{m} M) \longrightarrow \mathrm{K}^{+}(400 \mathrm{m} M)$ In this calculation, the $\Delta G^{\circ}$ term can be set to zero. What is the justification for this step?
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