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Click & Learn
Student
Worksheet
The Eukaryotic Cell Cycle and Cancer
In
Depth
INTRODUCTION
This handout complements the Click & Learn The Eukaryotic Cell Cycle and Cancer and is intended as an in-
depth examination of the cell cycle and the protein players involved. For a more general overview, please see
the overview version.
PROCEDURE
Follow the instructions as you proceed through the Click & Learn and answer the questions in the spaces below.
Click on the “Background” tab on the right side.
1. Compare and contrast the reasons cell division is important for unicellular (single-celled) and multicellular
organisms.
2. Provide an example of why cell division remains important to an adult organism even after it is fully
developed.
3. What is the role of growth factors?
4. Cells divide, differentiate, or die. What is differentiation?
5. What is apoptosis? Explain its purpose.
6. Organisms maintain the right number of cells by regulating the cell cycle. What are “cell cycle regulators?”
7. Watch the video clip of cells in the small intestine. Name the general location along the villus where the
following processes occur:
Cell Division:
Cell Differentiation:
Apoptosis:
Cell Cycle
Updated February 2020
www.BioInteractive.org
Page 1 of 6
Click & Learn
epth The Eukaryotic Cell Cycle and Cancer – In D
Student Worksheet
8. Name one harmless result of too little cell division.
9. Name one harmless result of too much cell division.
Click on the section of the circle labeled “Cell Cycle Phases” in the center purple circle on the right and use
the “Overview” information in the window on the left to answer the questions below.
10. List, in order, the four eve
nts we collectively call the “cell cycle.” Next to each event, write the correlating
cell cycle phase name.
a.
b.
c.
d.
11. In general, w
hat is the purpose of a checkpoint in the cell cycle?
12. What is one potential outcome when errors occur in this highly regulated cell cycle process?
Click on “Cell Cycle Regulators and Cancer” in the center purple circle on the right. Use the information under
“Regulators Overview” in the window on the left to answer the questions below.
13. What type of protein that regulates the cell cycle is encoded by proto-oncogenes?
14. What type of protein that regulates the cell cycle is encoded by tumor suppressor genes?
15. The most important cell cycle regulators are the ______________________________________ .
16. What is a kinase, and what does it do?
17. When are CDKs present inside the cell during the cell cycle?
18. When are cyclins present inside the cell during the cell cycle?
Cell Cycle
Updated February 2020
www.BioInteractive.org
Page 2 of 6
Click & Learn
epth The Eukaryotic Cell Cycle and Cancer – In D
Student Worksheet
19. CDKs form molecular complexes with cyclins. What do activated CDK-cyclin complexes do?
Using the cell cycle diagram on the right and both links in the center purple circle, complete the table below
for each phase. Use bullet points and focus on major events that occur during each phase, checkpoint, and
regulatory process. Complete the entire row before moving on to the next phase.
PHASE PHASE EVENTS CHECKPOINT EVENTS REGULATORY PROCESSES
G1
S
G2
M
(mitosis)
20. Go to “Cell Cycle Phases” and click on “Interphase.” The interphase alternates with mitosis. What happens
during interphase and what phases does it include?
21. Go to “Cell Cycle Phases” and click on “G0.” The G0 phase is a resting or nondividing stage. What three
factors determine if a cell enters G0?
Cell Cycle
Updated February 2020
www.BioInteractive.org
Page 3 of 6
Click & Learn
epth The Eukaryotic Cell Cycle and Cancer – In D
Student Worksheet
22. Provide an example of a fully differentiated cell that is (a) permanently in G0 and (b) one that can leave G0
to progress through the cell cycle and divide again.
a.
b.
Click on “Cell Cycle Regulators and Cancer” in the center purple circle on the right. Then click on the “Cancer
Overview” tab in the window to the left (right tab).
23. Cancer is an improperly regulated cell cycle. Name two reasons why cells can form tumors.
24. What causes uncontrolled cell division at the genetic level?
25. Watch the video clip. At the cellular level in this example, explain what occurs if the APC gene is mutated.
26. Normally, proto-oncogenes stimulate the cell cycle. What do mutated proto-oncogenes (i.e., oncogenes)
cause?
27. Normally, tumor suppressor genes inhibit the cell cycle. What do mutated tumor suppressor genes cause?
28. To cause cancer, proto-oncogenes require ___ 1 (or) ___ 2 allele(s) to be mutated and are therefore
considered ___ dominant (or) ___ recessive. This results in a ___________ of function.
29. To cause cancer, tumor suppressor genes require ___ 1 (or) ___ 2 allele(s) to be mutated and are therefore
considered ___ dominant (or) ___ recessive. This results in a ___________ of function.
30. Watch the video clip.
a. Using the gas pedal analogy, explain the impact on the cell cycle of a proto-oncogene versus an
oncogene.
b. Using the brake pedal analogy, explain the impact on the cell cycle of one mutated tumor suppressor
gene allele versus two mutated tumor suppressor alleles.
Cell Cycle
Updated February 2020
www.BioInteractive.org
Page 4 of 6
Click & Learn
epth The Eukaryotic Cell Cycle and Cancer – In D
Student Worksheet
ADVANCED EXTENSION QUESTIONS (OPTIONAL)
Now that you have finished the Click & Learn, use your knowledge to answer the following questions.
31. p53 is a protein that is encoded by a tumor suppressor gene, and some scientists refer to it as “the
guardian of the genome.”
a. Explain its normal role and why scientists would regard it as the “guardian of the genome.”
b. Explain what happens to the cell cycle if both alleles of the gene encoding p53 are mutated.
32. Explain why people who inherit one mutated allele of the BRCA1 gene have a higher likelihood of
developing cancer.
33. Predict a potential outcome of a mutated mitotic arrest deficient (MAD) protein.
34. Use the model illustrated in the figure below to answer the accompanying questions.
Cell Cycle
Updated February 2020
www.BioInteractive.org
Page 5 of 6
Click & Learn
epth The Eukaryotic Cell Cycle and Cancer – In D
Student Worksheet
a. The human gene EGFR located on chromosome 7 is a proto-oncogene that codes for a growth factor
c
ell surface receptor. The binding of growth factors to this receptor can lead to cell proliferation
.
H
ypothesize what potential impact a mutated EGFR allele will have on a cell. Give one possible impac
t
a
nd explain your answer
.
b. RAS is a G protein that is activated when a growth factor attaches to EGFR. Its activation results in the
exchange of GTP for GDP. Once activated, the GTP cannot be hydrolyzed and RAS cannot be deactivated
What is one potential outcome of a mutation in one of the two copies of RAS?
c. Mutations in the genes that code for proteins in this pathway have been linked to various types of
c
ancer (i.e., RAS: pancreatic, BRAF: colorectal, MEK: melanoma, EGFR: lung). If you were developin
g a
n
ew cancer drug, what would be an appropriate target protein for the new drug therapy? Justify you
r
an
swe
r.
Cell Cycle
Updated February 2020
www.BioInteractive.org
Page 6 of 6
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