Name: 
 

Chapter 12 Online Questions



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

 1. 

If there are 20 chromatids in a cell at metaphase, how many chromosomes are there in each daughter cell following cytokinesis?
a.
10
b.
20
c.
30
d.
40
e.
80
 

 2. 

Which of the following organisms does not reproduce cells by mitosis and cytokinesis?
a.
cow
b.
bacterium
c.
mushroom
d.
cockroach
e.
banana tree
 
 
The following questions consist of five phrases or sentences related to the control of cell division. For each one, select the term below that is most closely related to it. Each term may be used once, more than once, or not at all.

A.
PDGF
B.
MPF
C.
protein kinase
D.
cyclin
E.
Cdk
 

 3. 

triggers the cell's passage past the G2 checkpoint into mitosis
a.
A
b.
B
c.
C
d.
D
e.
E
 

 4. 

a general term for enzymes that activate or inactivate other proteins by phosphorylating them
a.
A
b.
B
c.
C
d.
D
e.
E
 

 5. 

a protein maintained at constant levels throughout the cell cycle that requires cyclin to become catalytically active
a.
A
b.
B
c.
C
d.
D
e.
E
 

 6. 

Movement of the chromosomes during anaphase would be most affected by a drug that
a.
reduces cyclin concentrations.
b.
increases cyclin concentrations.
c.
prevents elongation of microtubules.
d.
prevents shortening of microtubules.
e.
prevents attachment of the microtubules to the kinetochore.
 

 7. 

Where do the microtubules of the spindle originate during mitosis in both plant and animal cells?
a.
centromere
b.
centrosome
c.
centriole
d.
chromatid
e.
kinetochore
 
 
The questions below refer to the following terms. Each term may be used once, more than once, or not at all.

A.
telophase
B.
anaphase
C.
prometaphase
D.
metaphase
E.
prophase
 

 8. 

This is the longest of the mitotic stages.
a.
A
b.
B
c.
C
d.
D
e.
E
 

 9. 

Centrioles begin to move apart in animal cells.
a.
A
b.
B
c.
C
d.
D
e.
E
 

 10. 

Two centrosomes are arranged at opposite poles of the cell.
a.
A
b.
B
c.
C
d.
D
e.
E
 

 11. 

Cytoskeletal elements play important roles in cell division. The mitotic spindle apparatus is made of ____ and pulls sister chromatids apart, whereas the contractile ring is made of ____ and required for the separation of daughter cells at the end of the mitotic phase of the cell cycle.
a.
intermediate filaments; actin microfilaments
b.
microtubules; actin microfilaments
c.
microtubules; contractile filaments
d.
intermediate filaments; contractile filaments
e.
actin microfilaments; myosin
 

 12. 

Cells that are in a nondividing state are in which phase?
a.
G0
b.
G2
c.
G1
d.
S
e.
M
 

 13. 

If there are 20 chromatids in a cell, how many centromeres are there?
a.
10
b.
20
c.
30
d.
40
e.
80
 

 14. 

The formation of a cell plate is beginning across the middle of a cell and nuclei are re-forming at opposite ends of the cell. What kind of cell is this?
a.
an animal cell in metaphase
b.
an animal cell in telophase
c.
an animal cell undergoing cytokinesis
d.
a plant cell in metaphase
e.
a plant cell undergoing cytokinesis
 

 15. 

How do the daughter cells at the end of mitosis and cytokinesis compare with their parent cell when it was in G1 of the cell cycle?
a.
The daughter cells have half the amount of cytoplasm and half the amount of DNA.
b.
The daughter cells have half the number of chromosomes and half the amount of DNA.
c.
The daughter cells have the same number of chromosomes and half the amount of DNA.
d.
The daughter cells have the same number of chromosomes and the same amount of DNA.
e.
The daughter cells have the same number of chromosomes and twice the amount of DNA.
 

 16. 

Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early embryo with how many cells?
a.
4
b.
8
c.
16
d.
32
e.
64
 

 17. 

Which of the following is true concerning cancer cells?
a.
They do not exhibit density-dependent inhibition when growing in culture.
b.
When they stop dividing, they do so at random points in the cell cycle.
c.
They are not subject to cell cycle controls.
d.
B and C only
e.
A, B, and C
 

 18. 

What is the name for the special region on a duplicated chromosome that holds the sister chromatids together?
a.
centrosome
b.
centromere
c.
kinetochore
d.
desmosome
e.
microtubule organizer region
 

 19. 

Which of the following is (are) true concerning cyclin-dependent kinase (Cdk)?
a.
Cdk is inactive, or "turned off," in the presence of cyclin.
b.
Cdk is present throughout the cell cycle.
c.
Cdk is an enzyme that attaches phosphate groups to other proteins.
d.
Both A and B are true.
e.
Both B and C are true.
 

 20. 

Proteins that are involved in the regulation of the cell cycle, and that show fluctuations in concentration during the cell cycle, are called
a.
ATPases.
b.
kinetochores.
c.
centrioles.
d.
proton pumps.
e.
cyclins.
 



 
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