Ms Gandla
Date ____________________ Period__________ Name___________________________________
Active transport
Sodium potassium pump
1. The sodium-potassium pump functions to pump
A) sodium ions out of the cell and potassium ions into the cell.
B) sodium ions into the cell and potassium ions out of the cell.
C) sodium and potassium ions into the cell.
D) sodium and potassium ions out of the cell.
E) sodium and potassium ions in both directions across the cell membrane.
2. What is the source of energy used to power the sodium-potassium pump?
A) breakdown of ATP
B) formation of ATP
C) transport of ATP by the pump
D) breakdown of GTP
E) transport of GTP by the pump
3. During one cycle, the sodium-potassium pump binds and moves.
A) 1 Na+ and 2 K+.
B) 2 Na+ and 2 K+.
C) 2 Na+ and 3 K+.
D) 3 Na+ and 2 K+.
E) 3 Na+ and 3 K+.
B) False
5.The binding and release of sodium or potassium ions are due to conformational changes in the protein.
A) True
B) False
Exocytosis and Endocytosis
6. Exocytosis is a process by which cells
A) release substances from the cell through pores in the cell membrane.
B) release substances from the cell via vesicles.
C) release substances from the cell via carrier proteins.
D) bring in substances from the outside via vesicles.
E) bring in substances from the outside via pores in the cell membrane.
7. Certain white blood cells engulf microorganisms and bring them in to digest them. This process is best described as
A) pinocytosis.
B) osmosis.
C) receptor-mediated exocytosis.
D) phagocytosis.
E) diffusion.
8. Which of the following statements about receptor-mediated endocytosis is TRUE?
A) it is used to transport material out of the cell
B) it is not specific
C) it involves clathrin-coated pits
D) it involves transport of material into the cell through pores in the cell membrane
E) none of the above
9. If the material the cell takes in is liquid, the process is termed pinocytosis.
A) True
B) False
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