Questions on the Sodium-Potassium Pump
20 multiple choice questions on the Sodium-Potassium Pump, followed by the answer key at the end.
Multiple Choice Questions: Sodium-Potassium Pump
1. What type of transport is the sodium-potassium pump?
A) Passive transport
B) Facilitated diffusion
C) Active transport
D) Osmosis
2. What does the sodium-potassium pump move across the membrane?
A) Water and carbon dioxide
B) Sodium and potassium ions
C) Glucose and oxygen
D) Hydrogen and calcium ions
3. How many sodium ions are pumped out of the cell?
A) 1
B) 2
C) 3
D) 4
4. How many potassium ions are pumped into the cell?
A) 1
B) 2
C) 3
D) 4
5. What energy source is required for the sodium-potassium pump to function?
A) Glucose
B) Oxygen
C) DNA
D) ATP
6. Which direction do sodium ions move in the pump?
A) Into the cell
B) Out of the cell
C) Stay in the cytoplasm
D) Equally in both directions
7. Which direction do potassium ions move in the pump?
A) Into the cell
B) Out of the cell
C) Stay in the extracellular space
D) None
8. The sodium-potassium pump helps maintain:
A) Blood sugar levels
B) Cell wall strength
C) Membrane potential
D) Ribosome production
9. The sodium-potassium pump is most important in which type of cells?
A) Muscle cells
B) Skin cells
C) Red blood cells
D) Brain and nerve cells
10. What is the ratio of Na⁺ to K⁺ moved by the pump?
A) 2 Na⁺:3 K⁺
B) 3 Na⁺:2 K⁺
C) 1 Na⁺:1 K⁺
D) 4 Na⁺:4 K⁺
11. Which protein facilitates the sodium-potassium pump?
A) Channel protein
B) Enzyme
C) Carrier protein
D) Hormone receptor
12. What process causes a conformational change in the sodium-potassium pump?
A) Glucose bonding
B) Binding of water
C) Phosphorylation by ATP
D) Osmotic pressure
13. What does phosphorylation do in the pump’s activity?
A) Stops the pump
B) Provides a signal for translation
C) Changes the shape of the protein
D) Sends a message to the nucleus
14. Why is the sodium-potassium pump called electrogenic?
A) It uses voltage from outside
B) It moves equal charges
C) It helps generate a charge difference
D) It generates electricity directly
15. How does the pump contribute to nerve impulse transmission?
A) It transports neurotransmitters
B) It resets ion gradients after an impulse
C) It blocks ion channels
D) It stores electrical signals
16. How often does the sodium-potassium pump operate?
A) Only during rest
B) Only when stimulated
C) Continuously
D) During cell division only
17. Failure of the sodium-potassium pump would result in:
A) Improved respiration
B) Uncontrolled mitosis
C) Disrupted ion balance and cell swelling
D) Increased DNA synthesis
18. Which of the following inhibits the sodium-potassium pump?
A) ATP
B) Glucose
C) Ouabain
D) Water
19. In a single cycle, how many total ions are moved across the membrane?
A) 2
B) 3
C) 5
D) 6
20. The sodium-potassium pump is located in which part of the cell?
A) Cytoplasm
B) Nucleus
C) Mitochondria
D) Plasma membrane
Answer Key
1. C) Active transport
2. B) Sodium and potassium ions
3. C) 3
4. B) 2
5. D) ATP
6. B) Out of the cell
7. A) Into the cell
8. C) Membrane potential
9. D) Brain and nerve cells
10. B) 3 Na⁺:2 K⁺
11. C) Carrier protein
12. C) Phosphorylation by ATP
13. C) Changes the shape of the protein
14. C) It helps generate a charge difference
15. B) It resets ion gradients after an impulse
16. C) Continuously
17. C) Disrupted ion balance and cell swelling
18. C) Ouabain
19. D) 5 (3 Na⁺ out + 2 K⁺ in = 5 ions total)
20. D) Plasma membrane
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