Test: Cell Membrane, Passive and Active Transport, Endocytosis, and Exocytosis
Teacher: Mr. Nebbe
1. What materials make up a cell membrane?
a. Phospholipids, carbohydrates, and proteins
b. Cholesterol and nucleic acids
c. Proteins, nucleic acids, and cholesterol
d. Phospholipids, cholesterol, and proteins
2. What type of receptor do you find within a cell?
a. Intracellular receptor
b. Membrane receptor
c. Intercellular receptor
d. None of the above
3. What type of membrane allows some molecules to cross but not all?
a. Diffusible
b. Impermeable
c. Selectively permeable
d. Permeable
4. What part of a phospholipid is hydrophilic?
a. The whole phospholipid
b. The glycerol molecule
c. The fatty acid tail
d. The phosphate head
5. If a molecule is hydrophobic, it means that it “loves” water.
a. True
b. False
6. What statement below best characterizes the Fluid Mosaic Model of the cell Membrane?
a. The cell membrane is rigid and self-healing.
b. The cell membrane is flexible and the phospholipids can slide around one another.
c. The cell membrane is flexible and made principally of phosphoproteins.
d. The cell membrane’s lipid layer is dense and ridged while the phosphate heads are flexible.
7. Diffusion and facilitated diffusion are types of . . .
a. active transport
b. passive transport
8. What word best describes the change in the concentration of a molecule from the inside of a cell to
the outside of a cell?
a. High concentration
b. Low concentration
c. Concentration gradient
d. Molecular gradient
Use the following terms to answer questions 8 through 12. Each term can only be used once.
Hypotonic,
9.
Diffusion,
Hypertonic,
Isotonic,
Facilitated diffusion
In _______________________, molecules cross the cell membrane, along the concentration
gradient, through protein channels.
10. In our naked egg experiment, water flowed from the vinegar into the egg; this meant that the
vinegar was ___________________________ to our egg.
11. You notice water is flowing out of a cell; therefore, you reason that the cell must be immersed in a
____________________ solution.
12. _________________ is the movement of molecules in a liquid or a gas from a region of higher
concentration to a region of lower concentration.
13. A solution is __________________ to a cell when it has the same concentration of dissolved
particles as is found inside the cell (the cell is at equilibrium).
14. What word(s) describes the diffusion of water through a selectively permeable membrane down a
concentration gradient?
a. Osmosis
b. Fluid diffusion
c. Hydro-diffusion
d. ATP
15. How could you make a hypertonic solution isotonic?
a. Add more solutes
b. Add water
c. Both a and b
d. None of the above
16. Facilitated diffusion requires the cell to expend energy.
a. True
b. False
17. In the propagation of an action potential, sodium crosses the cell membrane through a protein
channel using what kind of transport?
a. Active transport
b. A sodium/potassium pump
c. Diffusion
d. Facilitated diffusion
18. What term describes the movement of molecules from a region of low concentration to high
concentration?
a. Passive transport
b. Active transport
c. Osmosis
d. Diffusion
19. ATP, chemical energy made by the cell, is required to move oxygen molecules across a cell
membrane from a region of higher oxygen molecule concentration to an area of low oxygen
molecule concentration.
a. True
b. False
20. In our neurons, the sodium/potassium pump is what form of cellular transport?
a. Passive transport
b. Active transport
c. Exocytosis
d. Endocytosis
21. We associate the term “engulfing” with what type of cellular transport?
a. Exocytosis
b. Active transport
c. Endocytosis
d. Diffusionalcytosis
22. Amoebas capture their prey, the hapless paramecia, through what type of cellular transport?
a. Endocytosis
b. Active transport
c. Exocytosis
d. None of the above
23. Our white blood cells “attack” and devour their prey, bacteria and viruses that might harm us
through what process?
a. Exocytosis
b. Cellular absorption
c. Phagocytosis
d. Lysosomal disintegration
24. Phagocytosis is a special form of endocytosis.
a. True
b. False
Use the following five terms to answer questions 25 through 29. Each term is used only once.
Exocytosis, Pump, Active Transport, Endocytosis,
Facilitated diffusion
25. In an axon at the end of a neuron, neurotransmitter is released into the synaptic cleft through
_____________________________.
26. The polarity of the neuron, after an action potential has passed through, is restored by a
sodium/potassium ________________________.
27. Hydrogen ions were moved from the inside of the mitochondrial inner membrane to the outside of
the inner membrane by _______________________________.
28. _______________________ begins when the cell makes a pocket in its cell membrane in order to
engulf a substance (like a protein or other large molecule(s)).
29. The movement of ions (like sodium, potassium, and hydrogen) through a protein channel with the
concentration gradient (from higher to lower) is known as _____________________________.
30. If vesicles originating from the Golgi apparatus were unable to fuse with the cell membrane, then
exocytosis could not take place.
a. True
b. False
31. (Challenge question) After a neuron has released its neurotransmitter into the synaptic cleft, to
what type of receptor, on the neuron on the other side of the cleft, does the neurotransmitter bind?
32. (Challenge question – worth 2 points) How was the soap membrane (think back to our membrane
lab activity) like a cell membrane?
33. (Challenge question – worth 2 points) What would happen if oxygen was unable to diffuse across a
cell membrane? Explain your answer.