Membrane Practice Test
AP Biology
Choose the response which best completes the following statements or answers
the following questions.
1. If a solution outside a cell is more concentrated so that the cell loses water to
its environment,
the external solution is said to be __________ to the cell contents.
(1.) hypertonic (2.) in equilibrium (3.) isotonic (4.) hypotonic
2. Which mechanism requires energy? (1.) facilitated diffusion (2.) osmosis (3.)
diffusion (4.) active transport
3. Pinching in of fluids by a unicellular organism is the process of (1.)
phagocytosis (2.) osmosis (3.) pinocytosis
(4.) exocytosis (5.) facilitated diffusion
4. Certain types of lymphocytes (white blood cells) in the lymph nodes ingest
bacteria and debris.
This function most likely occurs by (1.) exocytosis (2.) passive transport (3.)
phagocytosis
(4.) pinocytosis (5.) facilitated transport
5. Osmosis is a process that (1.) involves the movement of particles from
saturated solutions
(2.) moves water molecules from an area of higher concentration to an area of
lower concentration, using energy
(3.) involves the active transport of dissolved solids
(4.) continues until the medium on each side of the membrane has become
hypertonic
(5.) equalizes the concentration of particles by the movement of water
molecules
Use the information below and your knowledge of biology to answer questions
6 through 7 which follow the reading passage.
Each student in a biology laboratory received two solutions. One solution was
distilled water. The other was a salt solution
with concentrations of salts slightly greater than that of a living cell. The
solutions were labeled X and Y, respectively.
The students were instructed to place some fresh-water protozoans in each of
the solutions and to identify the solutions on the basis
of their observations. The protozoans in solution X shriveled. Those in solution
Y swelled up and burst.
6. These results indicate that (1.) solution X was salt water (2.) solution Y
contained killer protozoans (3.) solution Y was salt water
(4.) solution X was distilled water (5.) solution X was tap water
7. The protozoans in solution X shriveled because (1.) an antagonistic
substance was placed into the solution
(2.) their membranes were more permeable to the passage of water than the
organisms in Y (3.) osmotic pressure failed to operate
(4.) a disproportionate amount of water diffused from the protozoans (5.) golgi
bodies in the test organisms lost their function
8. In pond water, protozoans pump out excess water by means of their (1.)
pellicle (2.) trichocyst (3.) cell membrane (4.) contractile vacuole (5.)
pseudopodia
9. Which substance would have normally have the LEAST difficulty crossing a
cell membrane? (1.) water (2.) protein (3.) carbohydrate
(4.) salt (5.) there would be little difference in any of the above
10. Which requires the chemical energy of the cell to occur? (1.) diffusion (2.)
facilitated diffusion (3.) osmosis (4.) bulk flow (5.) none of the previous
11. Phospholipid molecules in a membrane are arranged with their ____ on the exterior
and their ____ on the interior.
(1.) hydrophobic heads ... hydrophilic tails (2.) hydrophilic heads ... hydrophobic
tails (3.) nonpolar heads ... polar tails
(4.) hydrophobic tails ... hydrophilic heads (5.) hydrophilic tails ... hydrophobic heads
12. In osmosis, water always moves toward the ____ solution: that is, toward the
solution with the ____ solute concentration.
(1.) isotonic ... greater
(2.) hypertonic ... greater (3.) hypertonic ... lesser (4.) hypotonic ... greater (5.)
hypotonic ... lesser
13. The concentration of calcium in a cell is 0.3%. The concentration of calcium in the
surrounding fluid is 0.1%. How could the cell obtain more calcium?
(1.) passive transport (2.) diffusion (3.) active transport (4.) osmosis (5.) any of the
prior methods could be used
14. The movement of molecules from an area of higher concentration to an area of lower
concentration is called _____. (1.) diffusion (2.) endocytosis
(3.) phagocytosis (4.) active transport (5.) osmosis
15. Which statement best describes phagocytosis?
(1.) Cells use this process to export products such as insulin or thyroxine.
(2.) A cell engulfs a particle by wrapping pseudopodia around it and
packaging it within a vacuole. (3.) Small droplets of extracellular fluid and
all the dissolved solutes enter the cell by this process.
(4.) Only specific extracellular ligands enter the cell in this fashion.
(5.) After entry, the endocytotic vesicle migrates to and fuses with the
Golgi apparatus.
16. The secretion of neurotransmitters out of the nerve cell, from small vesicles at the
end of the axon, can be considered an example of (1.) exocytosis (2.) endocytosis
(3.) phagocytosis (4.) pinocytosis (5.) osmoregulation
17. The transport of molecules of a particular solute from inside an animal cell
across the cell membrane to the extracellular fluid always requires energy when
(1.) the lipid bilayer is permeable to the solute
(2.) the concentration of the solute is higher inside the cell than outside it
(3.) the concentration of the solute is lower inside the cell than outside it
(4.) a transport protein is involved in the movement of the molecules
(5.) the cytoskeleton blocks all available channels
18. If the volume of a cell increases when it is placed in an aqueous solution,
that solution is said to be __________ to the cell. (1.) hypertonic
(2.) subatomic (3.) isotonic (4.) cold and cough tonic (5.) hypotonic
19. Which process is best represented by the diagram below
(1.) endocytosis
(2.)
active transport (3.)
exocytosis
(4.) biocytosis
20. Oxygen enters the blood from the alveoli in the lungs by the process of
(1.) phagocytosis (2.) active transport (3.) osmosis (4.) diffusion
(5.) facilitated diffusion
21. A ______ protein allows a particular molecule or ion to freely cross the
plasma membrane as it enters or exits the cell. (1.) cell-recognition
(2.) carrier (3.) receptor (4.) enzymatic (5.) transport or channel
22. A ______ protein combines with a substance and helps to move it across
the membrane. (1.) carrier (2.) channel (3.) cell-recognition
(4.) receptor (5.) enzymatic
23. Which cell process is represented by the diagram below?
(1.) pinocytosis
(2.)
osmosis
(3.) diffusion (4.) exocytosis
24. The rate of transport of a substance into a cell is drastically reduced when the
formation of ATP is blocked.
The transport system must be a form of (1.) active transport (2.) simple diffusion
(3.) facilitated diffusion
(4.) both active transport and simple diffusion (5.) both simple and facilitated
diffusion
25. What is the term used to describe the movement of any material from high to
low concentration called? (1.) facilitated diffusion (2.) equilibrium (3.) osmosis
(4.) diffusion (5.) active transport
26. Which substance is important to the structure of the cell membrane because it
helps the cell membrane keep its shape? (1.) cellulose (2.) cholesterol
(3.) lipid bilayer (4.) protein
27. Which term is used to describe the carrying of molecules across a membrane
that does not require energy. (1.) osmosis (2.) facilitated diffusion
(3.) active transport (4.) diffusion
28. Most of the cell membrane is made up of fats that are arranged in a
(1.) lipid bilayer (2.) cholesterol layer (3.) protein layer (4.) none of the above
29. The current theory of the structure of the plasma membrane is best described
by the _______ model. (1.) sandwich (2.) fluid-mosaic (3.) unit membrane
(4.) electrochemical (5.) unipermeable
30. If a cell is placed in a hypotonic solution, which will occur?
(1.) Salts will move into the cell from the surrounding solution.
(2.) Water will move into the cell from the surrounding solution.
(3.) Salts will move out of the cell into the surrounding solution.
(4.) Water will move out of the cell into the surrounding solution.
(5.) None of the above will occur.
31. If a cell is placed in a hypertonic solution, which will occur?
(1.) Salts will move into the cell from the surrounding solution.
(2.) Water will move into the cell from the surrounding solution.
(3.) Salts will move out of the cell into the surrounding solution.
(4.) Water will move out of the cell into the surrounding solution.
(5.) None of the above will occur.
32. Freshwater protozoans react to a/an _______ environment by removing
water through ________________________ (1.) hypertonic, turgor pressure
(2.) hypotonic, turgor pressure (3.) isotonic, a contractile vacuole
(4.) hypertonic, a contractile vacuole (5.) hypotonic, a contractile vacuole
33. Large amoeboid-type cells, called macrophages, remove bacteria and worn-out
red blood cells by a process called (1.) facilitated diffusion (2.) osmosis
(3.) exocytosis (4.) phagocytosis (5.) pinocytosis
34. The process by which a vesicle is formed at the plasma membrane to
bring substances into the cell is called (1.) endocytosis (2.) exocytosis (3.)
plasmolysis (4.) hemolysis
35. Which type of solution has a lower percentage of solute than the cell?
(1.) isotonic solution (2.) hypotonic solution (3.) hypoosmotic solution
(4.) hypertonic solution
36. Which structure prevents the plant cell from bursting when placed in a
hypotonic solution? (1.) central vacuole (2.) lysosome (3.) Golgi apparatus
(4.) cell wall (5.) plasma membrane
37. The diagram represents a cell in water. Formulas of molecules that can move
freely across the membrane are shown. Some molecules are located inside the
cell and others are in the water outside the cell. Based on the diagram of
molecules below, what would most likely happen to these molecules after a few
hours?
(1.) The concentration of O2 will increase outside the cell
(2.) The concentration of NH3 will increase inside the cell
(3.) The concentration of CO2 will increase outside the cell
(4.) The concentration of C6H12O6 will increase inside the cell
Correctly complete the following statements.
1. A solution which contains more a higher concentration of solute than the solution it is
being compared with is said to be _______________ to that solution.
2. The term ________________ refers to a solution containing a greater
concentration of solvent than the solution it is being compared with.
3. The release of materials from a cell by active transport which often involves
molecules which carry the materials from the cell is called
____________________.
Answers to this practice quiz
Membrane Practice Test Answers Multiple choice section
1. 1
11. 5
21. 4
31. 1
2. 4
12. 1
22. 5
32. 2
3. 3
13. 1
23. 4
33. 1
4. 3
14. 3
24. 1
34. 2
5. 5
15. 4
25. 2
35. 5
6. 1
16. 2
26. 4
36. 3
7. 4
17. 2
27. 4
(although
2 could 37. 4
be fought
over)
8. 4
18. 1
28. 5
9. 1
19. 2
29. 2
10. 4
20. 2
30. 3
Completion Questions
1. hypertonic
2. hypotonic
3. receptor mediated exocytosis
Number Name of
of
Structure
Structure
1
2
3
Function of Structure
glycoprotein
attaches to other molecules
(receptor)
phospholipid bilayer impermeable to most polar substances
integral protein
transport of materials through channel in
protein