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1. A student is trying to determine the type of membrane transport occurring in a cell. She finds that the molecule to be transported is very large and polar, and when transported across the membrane, no energy is required. Which of the following is the most likely mechanism of transport?
2. A researcher treats a solution containing animal cells with ouabain, a poisonous substance that interferes with the sodium–potassium ATPase embedded in the cell membrane, and the cell lyses as a result. Which of the following statements best describes ouabain's effects?
3. Resting membrane potential depends on:
I. the differential distribution of ions across the membrane.
II. active transport processes.
III. selective permeability of the phospholipid bilayer.
4. Which of the following is NOT a function of the cell membrane?
5. The dynamic properties of molecules in the cell membrane are most rapid in:
6. Which lipid type is LEAST likely to contribute to membrane fluidity?
7. A membrane receptor is most likely to be a(n):
8. Which of the following is NOT a cell–cell junction in animals?
9. Which of the following is true of diffusion and osmosis?
10. The bulk movement of liquid into a cell through vesicular infoldings is known as:
11. Which of the following is LEAST likely to be the resting membrane potential of a cell?
12. How does the inner mitochondrial membrane differ from the outer mitochondrial membrane?
13. For most cells, the extracellular calcium concentration is around 10,000 times higher than the intracellular calcium concentration. What is the membrane potential established by this electrochemical gradient?
14. Which of the following statements conflicts with the fluid mosaic model?
15. Which of the following is a sphingolipid?
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