What Is the Potential Across a Membrane If the Overall

question 15

Multiple Choice

What is the potential across a membrane if the overall Gibb's free energy change across the membrane is -19.3 kJ mol-1 and the pH difference across the membrane is 0.70 at 310K? (R = 8.315 J K-1 mol-1;F = 96,485 J V-1 mol-1)

• A)-0.16 V
• B)+.16 V
• C)-0.24 V
• D)+0.24 V

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Definitions:

Potassium Ion

A positively charged ion (K+) essential for various biological processes, including nerve transmission and muscle contraction.

Simple Diffusion

The movement of molecules from an area of higher concentration to an area of lower concentration without the need for energy input or assistance of membrane proteins.

Cellular Membrane

The cellular membrane, or plasma membrane, is the biological membrane that separates the interior of all cells from the outside environment, controlling the movement of substances in and out of cells.

Exocytosis

The active transport of materials out of the cell by fusion of cytoplasmic vesicles with the plasma membrane. Compare with endocytosis.