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Transcript
CLICKER QUESTIONS
For CAMPBELL BIOLOGY, NINTH EDITION
Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Chapter 12
The Cell Cycle
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Questions prepared by
Louise Paquin
McDaniel College
© 2011 Pearson Education, Inc.
Prokaryotic Division
Why don’t prokaryotic cells need to go through
the same cell cycle as eukaryotic cells?
© 2011 Pearson Education, Inc.
S Phase
How might you prove experimentally that DNA
replication (and therefore the replication of
chromosomes) happens during the S phase of
the cell cycle and not during mitosis?
© 2011 Pearson Education, Inc.
Chromosomes in the Cell Cycle
At what part of the cell cycle would you see a
chromosome that looks like this?
Give your reasons.
© 2011 Pearson Education, Inc.
Evolution
What do the differences
among the division of
these cells demonstrate?
© 2011 Pearson Education, Inc.
Kinetochore
Which of the following best describes the kinetochore?
a) a structure composed of several proteins that associate with
the centromere region of a chromosome and that can bind to
spindle microtubules
b) the centromere region of a metaphase chromosome at which
the DNA can bind with spindle proteins
c) the array of vesicles that will form between two dividing nuclei
and give rise to the metaphase plate
d) the ring of actin microfilaments that will cause the appearance
of the cleavage furrow
e) the core of proteins that forms the cell plate in a dividing plant
cell
© 2011 Pearson Education, Inc.
Rate of Mitosis
If you were to examine a sample of connective
tissue cells from a small but adult mammal and
a second sample from a fetus of the same
species, in which would you expect to find
more cells undergoing mitosis? Why?
© 2011 Pearson Education, Inc.
Regulation of the Cell Cycle
A. What would you expect to happen if you
fuse a cell in S with a cell in G1? Why?
B. What would you expect to happen to a
nucleus from a G1 cell if it is introduced into an
enucleated M cell? Why?
© 2011 Pearson Education, Inc.
Regulation
Which of the following would need to be present to
produce a realistic signal to control the cell cycle?
(More than one may be required.)
a) a set of molecules that are sensitive to fluctuations
in the abundance of regulators
b) protein kinases
c) molecules that activate kinases
d) molecules that degrade activators
e) All of the above.
© 2011 Pearson Education, Inc.
Cancer Cells
At which part of the cell cycle would you expect
that a change in regulation could result in cancer?
Provide a reason for your answer.
© 2011 Pearson Education, Inc.