Name: 
 

Chapter 6 Online Quiz



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

 1. 

The advantage of light microscopy over electron microscopy is that
a.
light microscopy provides for higher magnification than electron microscopy.
b.
light microscopy provides for higher resolving power than electron microscopy.
c.
light microscopy allows one to view dynamic processes in living cells.
d.
both A and B
e.
both B and C
 

 2. 

In the fractionation of homogenized cells using centrifugation, the primary factor that determines whether a specific cellular component ends up in the supernatant or the pellet is
a.
the relative solubility of the component.
b.
the size and weight of the component.
c.
the percentage of carbohydrates in the component.
d.
the number of enzymes in the fraction.
e.
the presence or absence of lipids in the component.
 

 3. 

Which of the following are prokaryotic cells?
a.
plants
b.
fungi
c.
bacteria
d.
animals
e.
B and C only
 

 4. 

The volume enclosed by the plasma membrane of plant cells is often much larger than the corresponding volume in animal cells. The most reasonable explanation for this observation is that
a.
plant cells are capable of having a much higher surface-to-volume ratio than animal cells.
b.
plant cells have a much more highly convoluted (folded) plasma membrane than animal cells.
c.
plant cells contain a large vacuole that reduces the volume of the cytoplasm.
d.
animal cells are more spherical, while plant cells are elongated.
e.
the basic functions of plant cells are very different from those of animal cells.
 

 5. 

Which of the following comparisons between prokaryotic and eukaryotic cells is incorrect?
a.
The lack of organelles in prokaryotes means that they are structurally less complex than eukaryotes.
b.
The lack of internal membranes means that prokaryotes cannot compartmentalize function to the same extent as eukaryotes.
c.
All membrane function in prokaryotes is accomplished in the plasma membrane, while in eukaryotes, these functions are more distributed among the organelles.
d.
The specialization of function in organelles suggests that eukaryotes will contain a wider variety of phospholipids than prokaryotes.
e.
The lack of organelles in prokaryotes means that the basic cellular functions are different in prokaryotes than in eukaryotes.
 

 6. 

Which structure is the site of the synthesis of proteins that may be exported from the cell?
a.
rough ER
b.
lysosomes
c.
plasmodesmata
d.
Golgi vesicles
e.
tight junctions
 

 7. 

Which of the following cell components is not directly involved in synthesis or secretion?
a.
ribosome
b.
rough endoplasmic reticulum
c.
Golgi body
d.
smooth endoplasmic reticulum
e.
lysosome
 

 8. 

Which of the following statements correctly describes some aspect of protein excretion in prokaryotic cells?
a.
Prokaryotes are unlikely to be able to excrete proteins because they lack an endomembrane system.
b.
The mechanism of protein excretion in prokaryotes is probably the same as that in eukaryotes.
c.
Proteins that are excreted by prokaryotes are synthesized on ribosomes that are bound to the cytoplasmic surface of the plasma membrane.
d.
In prokaryotes, the ribosomes that are used for the synthesis of secreted proteins are located outside of the cell.
e.
Prokaryotes contain large pores in their plasma membrane that permit the movement of proteins out of the cell.
 

 9. 

Of the following, what do both mitochondria and chloroplasts have in common?
a.
ATP is produced.
b.
DNA is present.
c.
Ribosomes are present.
d.
B and C only
e.
A, B, and C are correct.
 

 10. 

A biologist ground up some plant leaf cells and then centrifuged the mixture to fractionate the organelles. Organelles in one of the heavier fractions could produce ATP in the light, while organelles in the lighter fraction could produce ATP in the dark. The heavier and lighter fractions are most likely to contain, respectively,
a.
mitochondria and chloroplasts.
b.
chloroplasts and peroxisomes.
c.
peroxisomes and chloroplasts.
d.
chloroplasts and mitochondria.
e.
mitochondria and peroxisomes.
 

 11. 

Which of the following is not a known function of the cytoskeleton?
a.
to maintain a critical limit on cell size
b.
to provide mechanical support to the cell
c.
to maintain the characteristic shape of the cell
d.
to hold mitochondria and other organelles in place within the cytosol
e.
to assist in cell motility by interacting with specialized motor proteins
 

 12. 

Which of the following pairs is mismatched?
a.
nucleolus-ribosomal RNA
b.
nucleus-DNA replication
c.
lysosome-protein synthesis
d.
cell membrane-lipid bilayer
e.
cytoskeleton-microtubules
 

 13. 

Which of the following contain the 9 + 2 arrangement of microtubules?
a.
cilia
b.
centrioles
c.
flagella
d.
A and C only
e.
A, B, and C
 

 14. 

All of the following structures and proteins are directly associated with movement in cells or by cells except
a.
cilia.
b.
dynein.
c.
actin.
d.
flagella.
e.
centrosomes.
 

 15. 

The cell walls of bacteria, fungi, and plant cells and the extracellular matrix of animal cells are all external to the plasma membrane. Which of the following is not a characteristic of all of these extracellular structures?
a.
They must be highly permeable to water and small molecules in order to allow cells to exchange matter and energy with their environment.
b.
They must permit information transfer between the cell's external environment and the cytoplasm.
c.
They must provide a rigid structure that maintains an appropriate ratio of cell surface area to volume.
d.
They are constructed of materials that are largely synthesized in the cytoplasm and then transported out of the cell.
e.
They are composed of a mixture of proteins and carbohydrates.
 



 
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