7. The sodium–potassium pump is an example of a system that uses primary active

Question

7. The sodium–potassium pump is an example of a system that uses primary active transport to set up conditions that will allow secondary active transport, in this case, of glucose. All of the following about the sodium–potassium pump are true except:
a. The Na+–K+ pump is an antiporter fueled by the hydrolysis of ATP.
b. The subsequent movement of glucose into the cell is against its concentration gradient.

c. The pump exports Na+ ions to the outside of the cell and establishes a concentration gradient for Na+.
d. K+ and Na+ both diffuse into the cell along their concentration gradients and drive the transport of glucose. e. The movement of glucose is coupled to the movement of Na+ by a symporter protein.

8. Persons with the inherited disease familial hypercholesterolemia have very high levels of cholesterol because of a. an inability of the liver to release cholesterol into the blood.
b. the inability to produce cholesterol.
c. deficient LDL receptor proteins that bind cholesterol in the liver.

d. deficient lysosomes in the liver. e. defective clathrin-coated vesicles.

9. In receptor-mediated endocytosis, a ligand will bind its receptor at a specific area of the cell membrane known as a coated pit. Which of the following is a function of the proteins coating the coated pits?
a. Supporting the receptors
b. Fusing with a lysosome

c. Providing stability for the vesicle
d. Targeting the coated vesicle to the lysosome

e. All of the above

11. You are studying how the protein transferrin enters cells. When you examine cells that have taken up transferrin, you find it inside clathrin- coated vesicles. Therefore the most likely mechanism for uptake of transferrin is
a. facilitated diffusion.
b. an antiporter.

c. receptor-mediated endocytosis. d. gap junctions.
e. ion channels.

12. Muscle function requires calcium ions (Ca2+) to be pumped into a subcellular compartment against a concentration gradient. What types of molecules are required for this to happen?

Explanation / Answer

Answer:

7. The sodium–potassium pump is an example of a system that uses primary active transport to set up conditions that will allow secondary active transport, in this case, of glucose. All of the following about the sodium–potassium pump are true except:

8. Persons with the inherited disease familial hypercholesterolemia have very high levels of cholesterol because of

9. In receptor-mediated endocytosis, a ligand will bind its receptor at a specific area of the cell membrane known as a coated pit. Which of the following is a function of the proteins coating the coated pits?

11. You are studying how the protein transferrin enters cells. When you examine cells that have taken up transferrin, you find it inside clathrin- coated vesicles. Therefore the most likely mechanism for uptake of transferrin is

12. Muscle function requires calcium ions (Ca2+) to be pumped into a subcellular compartment against a concentration gradient. What types of molecules are required for this to happen?

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