A Voltage Difference Is Maintained Across the Plasma Membrane

question 32

Multiple Choice

A voltage difference is maintained across the plasma membrane. This voltage difference

• A) is positive on the inside of the cell relative to the outside.
• B) does not require energy to generate and maintain.
• C) arises because the sodium-potassium pump pumps 2 Na⁺ in and 3 K⁺ out during one catalytic cycle.
• D) arises because the sodium-potassium pump pumps 2 K⁺ in and 3 Na⁺ out during one catalytic cycle.
• E) arises from secondary active transport.

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