Campbell Biology Chapter 12 Test Bank Exam Questions With Correct Answers
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Course
Campbell Biology
Institution
Campbell Biology
Campbell Biology Chapter 12 Test Bank Exam Questions With Correct Answers
1) Eukaryotic chromosomes are composed of which of the following macromolecules? - Answer-C) DNA and proteins
/.2) Starting with a fertilized egg (zygote), a series of six cell divisions would produce an early embryo wi...
1) Eukaryotic chromosomes are composed of which of the following macromolecules? -
Answer-C) DNA and proteins
/.2) Starting with a fertilized egg (zygote), a series of six cell divisions would produce an
early embryo with how many cells? - Answer-D) 64
/.3) In a diploid cell with 5 chromosome pairs (2n = 10), how many centromeres will be
found in a nucleus at G2 of the cell division cycle? - Answer-B) 10
/.4) Scientists isolate cells in various phases of the cell cycle. They isolate a group of
cells that have 1 1/2 times more DNA than G1 phase cells. What is the most likely part
of the cell cycle from which these cells were isolated? - Answer-D) in the S phase of the
cell cycle
/.5) G1 is associated with which of the following cellular events? - Answer-A) normal
growth and cell function
/.6) What is the name of the microtubule-organizing center found in animal cells as an
identifiable structure present during all phases of the cell cycle? - Answer-B)
centrosome
/.7) In the cells of many eukaryotic species, the nuclear envelope has to disappear to
permit which of the following events in the cell cycle? - Answer-B) attachment of
microtubules to kinetochores
/.8) The mitotic spindle plays a critical role in which of the following processes? -
Answer-D) separation of sister chromatids
/.9) Metaphase is characterized by ________. - Answer-A) alignment of chromosomes
on the equator of the cell
/.10) In what way do kinetochore microtubules facilitate the process of splitting the
centromeres? - Answer-B) They create tension by pulling toward opposite poles.
/.11) Certain cell types normally have several nuclei per cell. How could such
multinucleated cells be explained? - Answer-C) The cell underwent repeated mitosis,
but cytokinesis did not occur.
/.12) How is plant cell cytokinesis different from animal cell cytokinesis? - Answer-B)
Plant cells deposit vesicles containing cell wall building blocks on the metaphase plate;
animal cells form a cleavage furrow.
, /.13) FtsZ is a bacterial cytoskeletal protein that forms a contractile ring involved in
binary fission. Its function is analogous to ________. - Answer-A) the cleavage furrow of
eukaryotic animal cells
/.14) At which phase of the cell cycle do centrioles begin to move apart in animal cells? -
Answer-D) prophase
/.15) In a diploid cell with 5 chromosome pairs (2n = 10), how many sister chromatids
will be found in a nucleus at prophase of mitosis? - Answer-C) 20
/.16) If there are 40 centromeres in a cell at anaphase of mitosis, how many
chromosomes will be found in each daughter cell following cytokinesis? - Answer-B) 20
/.17) If a cell at metaphase of mitosis contains 20 sister chromatids, how many
chromosomes will be present in a G1 cell? - Answer-B) 10
/.18) Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells,
Taxol prevents microtubule depolymerization. Thus, Taxol stops mitosis by interfering
with which of the following structures or processes? - Answer-A) the mitotic spindle
/.19) Movement of the chromosomes during anaphase would be most affected by a
drug that prevents which of the following events in mitosis and cell division? - Answer-
C) shortening of microtubules
/.20) 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? - Answer-C) G2
/.21) A group of cells is assayed for DNA content immediately following mitosis and is
found to have an average of 8 picograms of DNA per nucleus. How many picograms of
DNA would be found in a nucleus at prophase of mitosis? - Answer-C) 16
/.22) The beginning of anaphase is indicated by which of the following processes? -
Answer-C) Enzymatic cleavage of cohesin.
/.23) During which phase of mitosis do the chromatids become chromosomes? -
Answer-B) anaphase
/.24) A cleavage furrow is ________. - Answer-C) a groove in the plasma membrane
between daughter nuclei
/.25) Use the figure to answer the question below. The unlettered circle at the top of the
figure shows a diploid nucleus with four chromosomes that have not yet replicated.
There are two pairs of homologous chromosomes, one long and the other short. One
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