Name: 
 

Ch. 4&5 Review


Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

1. 
Which of the following are sometimes referred to as rough or smooth, depending on the structure?
a.
Golgi bodies
b.
ribosomes
c.
mitochondria
d.
lysosomes
e.
endoplasmic reticula
 

2. 
Which of the following are the primary structures for the packaging of cellular secretions for export from the cell?
a.
Golgi bodies
b.
ribosomes
c.
mitochondria
d.
lysosomes
e.
endoplasmic reticula
 

3. 
Which of the following statements is true?
a.
When lipids and water are mixed, it is the water molecules that isolate themselves into droplets.
b.
When lipids and water are mixed, the lipids dissolve and enter into a solution.
c.
Lipids are classified as nonpolar substances and will not mix with water.
d.
Polar substances are able to pass through a plasma membrane more readily than nonpolar substances.
e.
All portions of a phospholipid molecule found in a membrane are classified as nonpolar.
 

4. 
Movement of a molecule against a concentration gradient is
a.
simple diffusion.
b.
facilitated diffusion.
c.
osmosis.
d.
active transport.
e.
bulk flow.
 

5. 
Oxygen, carbon dioxide, glucose, and other small molecules cross the plasma membrane through the process(es) of
a.
osmosis.
b.
diffusion.
c.
endocytosis and exocytosis.
d.
active transport.
e.
facilitated diffusion.
 

6. 
The cell wall
a.
provides skeletal support for plants.
b.
controls what enters and leaves a cell.
c.
replaces the plasma membrane of animal cells in plant cells.
d.
is found in all eukaryotes.
 

7. 
Which of the following affects the rate of diffusion through a semipermeable membrane?

      I. steeper concentration gradients
     II. higher temperatures
    III. molecular size
a.
I only
b.
II only
c.
I and II
d.
II and III
e.
I, II, and III
 

8. 
Most of the functions of plasma membranes are carried out by
a.
cholesterol.
b.
proteins.
c.
hydrophilic heads.
d.
hydrophobic tails.
e.
carbohydrates.
 

9. 
Which of the following statements is NOT true?
a.
A lipid bilayer is characteristic of all membranes.
b.
Cellular organelles are associated with membranes.
c.
In a plasma membrane, the hydrophilic portion is oriented to the outside of the cell.
d.
Lipid molecules make the cell membrane relatively impermeable to water.
e.
Even under extremely high magnification, an electron microscope cannot reveal the substructure of cell membranes.
 

10. 
If a cell did not have ribosomes, it would be unable to
a.
extract energy from glucose.
b.
synthesize glucose.
c.
store food in the form of fat.
d.
form proteins.
 

11. 
The net direction that an ion or molecule moves is
a.
dependent upon the size of the molecule.
b.
unpredictable because movement is random.
c.
controlled by the temperature of the medium.
d.
controlled by the membranes in the vicinity.
e.
the result of concentration differences.
 

12. 
Organelles that dramatically increase the surface area of a membrane are
a.
plastids.
b.
vacuoles.
c.
chloroplasts.
d.
nucleoli.
e.
microfilaments.
 

13. 
Which statement is true?
a.
A cell placed in an isotonic solution will swell.
b.
A cell placed in a hypotonic solution will swell.
c.
A cell placed in a hypotonic solution will shrink.
d.
A cell placed in a hypertonic solution will remain the same size.
e.
A cell placed in a hypotonic solution will remain the same size.
 

14. 
Wilting of a plant occurs
a.
if the plant is placed in an isotonic solution.
b.
if there is a rise in turgor pressure.
c.
as a result of facilitated diffusion.
d.
when a plant with flexible cell walls is placed in a hypertonic solution.
 

15. 
Which of the following are the primary cellular sites for the recapture of energy from carbohydrates?
a.
Golgi bodies
b.
ribosomes
c.
mitochondria
d.
lysosomes
e.
endoplasmic reticula
 

16. 
The method of movement that requires the expenditure of ATP molecules is
a.
simple diffusion.
b.
facilitated diffusion.
c.
osmosis.
d.
active transport.
e.
bulk flow.
 

17. 
If the volume of a cell increases, its surface area will
a.
decrease.
b.
remain the same.
c.
increase proportionately.
d.
increase to a greater degree.
e.
increase to a lesser degree.
 

18. 
Which of the following are found in both plant and animal cells?
a.
nucleus, Golgi body, chloroplasts
b.
ribosomes, mitochondria, plasma membranes
c.
centrioles, cell walls, nucleolus
d.
vacuoles, nucleolus, starch grains
 

19. 
Structural features that contain the protein actin and help to control the shapes of cells are
a.
plastids.
b.
vacuoles.
c.
microvilli.
d.
nucleoli.
e.
microfilaments.
 

20. 
Starch is stored in
a.
plastids.
b.
vacuoles.
c.
lysosomes.
d.
microvilli.
e.
any of the above
 

21. 
The organelle that pinches off portions of its membrane to form a vesicle used for storage or transport is the
a.
mitochondrion.
b.
chloroplast.
c.
nucleolus.
d.
Golgi body.
 

22. 
Which of the following are made of two subunits and are composed of RNA and protein?
a.
Golgi bodies
b.
mitochondria
c.
chloroplasts
d.
ribosomes
e.
endoplasmic reticula
 

23. 
A "9 + 2 array" refers to
a.
microtubules.
b.
Golgi bodies.
c.
ribosomes.
d.
cilia.
e.
both microtubules and cilia.
 

24. 
Which of the following is thought to be the descendant of engulfed ancient bacteria?
a.
nuclei
b.
Golgi bodies
c.
ER
d.
mitochondria
e.
lysosomes
 

25. 
Unsaturated tails of lipids
a.
are hydrophilic.
b.
are unstable and tend to break apart.
c.
have kinks in them and lessen the interaction between adjacent fat molecules.
d.
will break whenever exposed to phosphate ions.
e.
all of these
 



 
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