Multiple Choice
Which of the following statements about the mechanism of the sodium-potassium ATPase is FALSE?
11. Biological Membranes and Transport
Sodium-Potassium Ion Pump
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Which of the following defines the type of transport by the sodium-potassium ATPase?
A
Active transport through a symporter.
B
Passive transport through a symporter.
C
Active transport through an antiporter.
D
Facilitated diffusion through a symporter.
Verified step by step guidance1
Understand the role of sodium-potassium ATPase: It is an enzyme that helps maintain the electrochemical gradient across the cell membrane by moving sodium (Na⁺) and potassium (K⁺) ions against their concentration gradients.
Identify the type of transport: Sodium-potassium ATPase uses energy from ATP hydrolysis to transport ions, which classifies it as active transport.
Differentiate between symporter and antiporter: A symporter moves two different ions or molecules in the same direction across the membrane, while an antiporter moves them in opposite directions.
Recognize the function of sodium-potassium ATPase as an antiporter: It moves 3 Na⁺ ions out of the cell and 2 K⁺ ions into the cell, which is characteristic of an antiporter.
Conclude that the sodium-potassium ATPase is involved in active transport through an antiporter, as it uses ATP to move ions against their concentration gradients in opposite directions.
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