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CAMPBELL BIOLOGY CHAPTER 12 TEST PREPARATION QUESTIONS WITH CORRECT ANSWERS
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CAMPBELL BIOLOGY CHAPTER 12 TEST PREPARATION QUESTIONS WITH CORRECT ANSWERS
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CAMPBELL BIOLOGY CHAPTER 12TEST PREPARATION QUESTIONS WITH
CORRECT ANSWERS
The centromere is a region in which
A) chromatids remain attached to one another until anaphase.
B) metaphase chromosomes become aligned at the metaphase plate.
C) chromosomes are grouped during telophase.
D) the nucleus is located prior to mitosis.
E) new spindle microtubules form at either end. - Answer-A) chromatids remain
attached to one another until anaphase.
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 - Answer-D) 32
If there are 20 chromatids in a cell, how many centromeres are there?
A) 10
B) 20
C) 30
D) 40
E) 80 - Answer-A) 10
For a newly evolving protist, what would be the advantage of using eukaryote-like cell
division rather than binary fission?
A) Binary fission would not allow for the formation of new organisms.
B) Cell division would allow for the orderly and efficient segregation of multiple linear
chromosomes.
C) Cell division would be faster than binary fission.
D) Cell division allows for lower rates of error per chromosome replication.
E) Binary fission would not allow the organism to have complex cells. - Answer-B) Cell
division would allow for the orderly and efficient segregation of multiple linear
chromosomes.
Suppose a biologist can separate one of a dozen pieces of chromatin from a eukaryotic
(animal) nucleus. It might consist of which of the following?
,A) one-twelfth of the genes of the organism
B) two chromosomes, each with six chromatids
C) a single circular piece of DNA
D) two long strands of DNA plus proteins
E) two chromatids attached together at a centromere - Answer-D) two long strands of
DNA plus proteins
At which phase are centrioles beginning to move apart in animal cells?
A) telophase
B) anaphase
C) prometaphase
D) metaphase
E) prophase - Answer-E) prophase
If cells in the process of dividing are subjected to colchicine, a drug that interferes with
the formation of the spindle apparatus, at which stage will mitosis be arrested?
A) anaphase
B) prophase
C) telophase
D) metaphase
E) interphase - Answer-D) metaphase
If there are 20 centromeres in a cell at anaphase, how many chromosomes are there in
each daughter cell following cytokinesis?
A) 10
B) 20
C) 30
D) 40
E) 80 - Answer-B) 20
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 - Answer-B) centrosome
Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, Taxol
disrupts microtubule formation by binding to microtubules and accelerating their
assembly from the protein precursor, tubulin. Surprisingly, this stops mitosis.
Specifically, Taxol must affect
, A) the formation of the mitotic spindle.
B) anaphase.
C) formation of the centrioles.
D) chromatid assembly.
E) the S phase of the cell cycle. - Answer-A) the formation of the mitotic spindle.
Which of the following are primarily responsible for cytokinesis in plant cells but not in
animal cells?
A) kinetochores
B) Golgi-derived vesicles
C) actin and myosin
D) centrioles and centromeres
E) cyclin-dependent kinases - Answer-B) Golgi-derived vesicles
In which group of eukaryotic organisms does the nuclear envelope remain intact during
mitosis?
A) seedless plants
B) dinoflagellates
C) diatoms
D) dinoflagellates and diatoms only
E) seedless plants, dinoflagellates, and diatoms - Answer-D) dinoflagellates and
diatoms only
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. - Answer-D) prevents
shortening of microtubules.
Measurements of the amount of DNA per nucleus were taken on a large number of cells
from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per
nucleus. In which stage of the cell cycle did the nucleus contain 6 picograms of DNA?
A) G₀
B) G₁
C) S
D) G₂
E) M - Answer-D) G₂
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