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Physiology Practice Test: Cell Membrane Transport
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Cell membrane transport is a collection of mechanisms that regulate the passage of small molecules and ions through biological membranes.
 

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Physiology Practice Test: Cell Membrane Transport
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25 Questions

1. Pumps can move ions in either direction, as long as it is against that ionʹs electrochemical gradient.
2. The rate at which molecules are actively transported across a membrane is determined by the rate of transport of individual pumps and the number of pumps in the membrane.
3. Molecules with a relatively high lipid solubility are capable of crossing the membrane ________.
4. Which of the following does NOT directly determine the rate at which an ion will move passively across a membrane?
5. The hydrolysis of ATP on the Na+/K+ pump results in ________.
6. What are aquaporins?
7. An anion is found in greater concentration inside the cell than outside. Which of the following statements best describes forces acting on the anion at the resting membrane potential (-70 mV)?
8. If a negatively charged ion is more concentrated inside the cell, the forces required to balance the chemical gradient would be directed ________. Thus, the equilibrium potential for this ion would be ________ charged.
9. Which of the following factors does NOT directly affect the direction or magnitude of the electrical driving force?
10. Molecules tend to move spontaneously ________ their chemical gradient.
11. A cell is placed into a solution that has the same osmolarity. However, one of the solutes in the solution is able to move across the membrane (the cell does not contain this solute). After a period of time, the solution into which the cell was placed would become ________.
12. In general, the molecules that move through specific carrier proteins are determined by which of the following?
13. Which of the following is found in greater concentration inside the cell than outside?
14. Based solely upon its electrical charge, the inside of a typical cell will tend to attract extracellular ________ to move inward.
15. Which of the following statements about the Na+/K+ pump is FALSE?
16. At the resting membrane potential, a cell is at equilibrium.
17. Ions move passively down their electrochemical gradient.
18. Which of the following is NOT required to determine equilibrium potential of a particular ion?
19. The sodium-proton exchanger is an example of a(n) ________.
20. Which of the following pairs of characteristics is more likely to make a substance diffuse through the cell membrane?
21. If a positively charged ion is more concentrated inside the cell, the forces required to balance the chemical gradient would be directed ________. Thus, the equilibrium potential for this ion would be ________ charged.
22. Which of the following is a reflection of the unequal distribution of positive and negative ions across the plasma membrane?
23. Which of the following can be used to determine an ionʹs equilibrium potential?
24. In active transport, the affinity of the carrier protein for the molecule being transported is greater on which side of the membrane?
25. When a substance crossing the membrane is driven by diffusion, the net flux of that molecule can be described mathematically by ________.

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