Biology (Raven), 9th Edition

Chapter 10: How Cells Divide

Post-Test

1
Asters are
A)in the mitochondria.
B)in lysosomes.
C)arrays of short microtubules that radiate from the poles and may brace the centrioles against the membrane.
D)attached to ribosomes.
E)Bridges of microtubules between the centrioles and the opposite poles of the cell.
2
Spindle fibers first appear during
A)interphase.
B)prophase.
C)metaphase.
D)anaphase.
E)telophase.
3
In which stage are the chromosomes lined up on the equator during mitosis?
A)interphase
B)prophase
C)metaphase
D)anaphase
E)telophase
4
During which phase of mitosis does the nuclear membrane disappear and the chromosomes become distinct?
A)interphase
B)prophase
C)metaphase
D)anaphase
E)telophase
5
The process of creating two chromosomes from an original template is termed
A)transcription.
B)translation.
C)duplication.
D)fission.
E)replication.
6
Although all the DNA in a chromosome has been completely replicated after the S phase of the cell cycle, the centromere is a single unit that holds sister chromatids together until after cell division. Which protein holds the sister chromatids together at the centromere region?
A)Cohesin
B)Adhesin
C)Centromerin
D)Glycolipid
E)Kinetochore
7
What would happen if mitosis occurs without cytokinesis?
A)A multinucleate situation would occur.
B)The cell would die.
C)The cell will lose some of its chromosomes.
D)Cancer is a likely result due to the excessive numbers of genes in the cell.
E)A new species can arise.
8
What is the purpose of a "proto-oncogene"?
A)There's no particular purpose to genes given this name although most are involved in regulating the cell cycle, and if mutated, can give rise to cancer
B)These are viral genes which can hijack cells into dividing without responding to normal cellular cues.
C)These are critical genes that ordinarily provide for the well-being of the organism, but gain new functions, if mutated, that create tumors.
D)They are very ancient genetic signals, and provide for cell nutrition.
E)Proto-oncogenes are classes of related proteins which all occur sequentially on a chromosome. This allows them to be activated one-after-the-other to make the proteins required for an organism to thrive
9
Which term best describes how bacteria divide?
A)Binary fission
B)Mononuclear fusion
C)Meiosis
D)Mitosis
E)Replication
10
A visual arrangement of all the chromosomes in a cell is called a
A)Sister chromatid
B)Replicon
C)Karyotype
D)Mitotic bundle
E)Divisosome
11
The cell spends most of its time in the S phase of the cell cycle.
A)True
B)False
12
What is the name for the position at which the chromosome is constricted so that the sister chromatids are manipulated as a unit?
A)Centrosome
B)Telomere
C)Kinetochore
D)Centromere
E)Cohesion
13
Why is cell division in plants so different from that in animals?
A)Plants are unrelated to animals, so they have evolved different ways for their cells to divide.
B)Animals use their kinetic energy of motion to coax the cells into splitting.
C)The cell wall around each plant cell prevents constriction of the plasma membrane to cause the cells to divide.
D)Animal cells lack cellulose, and so a different method of splitting the cells had to be devised.
E)Organelles won't be properly positioned in plants because they are static, unchanging creatures.
14
The unrestrained, uncontrolled growth of cells in humans leads to the disease called
A)lupus.
B)nondisjunction.
C)cellular atropy.
D)cellular degeneration.
E)cancer.
15
The loss of function of these genes can cause cancer
A)Proto-oncogenes
B)Tumor-suppressor
C)Tumor-promotor
D)Oncogenes
E)rRNA genes
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