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The Cell Cycle/Mitosis
Chapter Questions
1) The centromere is a region in which
A) chromatids are attached to one another.
B) metaphase chromosomes become aligned.
C) chromosomes are grouped during telophase.
D) the nucleus is located prior to mitosis.
E) new spindle microtubules form.
2) What is a chromatid?
A) a chromosome in G1 of the cell cycle
B) a replicated chromosome
C) a chromosome found outside the nucleus
D) a special region that holds two centromeres together
E) another name for the chromosomes found in genetics
3) 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
4) 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
5) If there are 20 chromatids in a cell, how many centromeres are there?
A) 10
B) 20
C) 30
D) 40
E) 80
6) Which of the following statements is not true?
A) Mitosis produces new nuclei with exactly the same chromosomal endowment as the parent nucleus.
B) Mitosis may occur without cytokinesis.
C) Mitosis and cytokinesis are required for asexual reproduction.
D) All cells come from a preexisting cell.
E) The mitotic spindles in prokaryotic cells are composed of microtubules.
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13) If cells in the process of dividing are subjected to colchicine, a drug that interferes with the functioning
of the spindle apparatus, at which stage will mitosis be arrested?
A) anaphase
B) prophase
C) telophase
D) metaphase
E) interphase
Figure 12.2
15) If the cell whose nuclear material is shown in Figure 12.2 continues toward completion of mitosis,
which of the following events would occur next?
A) cell membrane synthesis
B) spindle fiber formation
C) nuclear envelope breakdown
D) formation of telophase nuclei
E) synthesis of chromatids
16) All of the following occur during prophase of mitosis in animal cells except
A) the centrioles move toward opposite poles.
B) the nucleolus can no longer be seen.
C) the nuclear envelope disappears.
D) chromosomes are duplicated.
E) the spindle is organized.
18) 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
23) All of the following occur during mitosis except the
A) condensing of chromosomes.
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B) uncoupling of chromatids at the centromere.
C) formation of a spindle.
D) synthesis of DNA.
E) disappearance of the nucleolus.
25) Cytokinesis usually, but not always, follows mitosis. If a cell completed mitosis but not cytokinesis,
the result would be a cell with
A) a single large nucleus.
B) high concentrations of actin and myosin.
C) two abnormally small nuclei.
D) two nuclei.
E) two nuclei but with half the amount of DNA.
26) Regarding mitosis and cytokinesis, one difference between higher plants and animals is that in plants
A) the spindles contain microfibrils in addition to microtubules, whereas animal spindles do not contain
microfibrils.
B) sister chromatids are identical, but they differ from one another in animals.
C) a cell plate begins to form at telophase, whereas animals a cleavage furrow is initiated at that stage.
D) chromosomes become attached to the spindle at prophase, whereas in animals chromosomes do not
become attached until anaphase.
E) spindle poles contain centrioles, whereas spindle poles in animals do not.
27) 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.
28) 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
31) Which of the following organisms does not reproduce cells by mitosis and cytokinesis?
A) cow
B) bacterium
C) mushroom
D) cockroach
E) banana tree
32) Chromosomes first become visible during ________ of mitosis.
A) prometaphase
B) telophase
C) prophase
D) metaphase
E) anaphase
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40) The somatic cells derived from a single-celled zygote divide by which process?
A) meiosis
B) mitosis
C) replication
D) cytokinesis alone
E) binary fission
44) Cells that are in a nondividing state are in which phase?
A) G0
B) G2
C) G1
D) S
E) M
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