BIO CHP 12

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cuz213022
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117605
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BIO CHP 12
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2011-11-17 21:03:54
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BIO CHP 12
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BIO CHP 12
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  1. All of the following statements are true except:
    A. the mitotic spindles in prokaryotic cells are composed of microtubules
    B. in eukaryotes, mitosis and cytokinesis are required for asexual reproduction
    C. all cells come from a preexisting cell
    D. mitosis may occur without cytokinesis
    E. mitosis produces new nuclei with exactly the same chromosomal endowment as the parent nucleus
    A. the mitotic spindles in prokaryotic cells are composed of microtubules
    (this multiple choice question has been scrambled)
  2. A cell containing 92 chromatids at metaphase of mitosis would, at its completion, produce two nuclei containing how many chromosomes?
    A. 12
    B. 46
    C. 16
    D. 92
    E. 23
    B. 46
    (this multiple choice question has been scrambled)
  3. 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. formation of telophase nuclei
    C. spindle fiber formation
    D. synthesis of chromatids
    E. muclear envelope breakdown
    B. formation of telophase nuclei
    (this multiple choice question has been scrambled)
  4. The S phase was measured by:
    A. synthesis versus breakdown of S protein
    B. counting the number of cells
    C. stopping G1
    D. synthesis of the S chromosome
    E. determining the start and stop of increased DNA in the cells
    E. determining the start and stop of increased DNA in the cells
    (this multiple choice question has been scrambled)
  5. Cytokinesis usually, but not always, follows mitosis. If a cell completed mitosis but not cytokinesis, what would be the result?
    A. a cell with two nuclei but with half the amount of DNA
    B. a cell with two abnormally small nuclei
    C. a cell with two nuclei
    D. a cell with a single large nucleus
    E. a cell with high concentrations of actin and myosin
    C. a cell with two nuclei
    (this multiple choice question has been scrambled)
  6. 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 fibers of the mitotic spindle
    B. anaphase
    C. formation of the centrioles
    D. chromatid assembly
    E. the Sphase of the cell cycle
    A. the fibers of the mitotic spindle
    (this multiple choice question has been scrambled)
  7. Cells that are in a nondividing state are in which phase?
    A. G2
    B. G0
    C. M
    D. G1
    E. S
    B. G0
    (this multiple choice question has been scrambled)
  8. Measurements of the amount of DNA per nucleus were taken on a larger 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 was the nucleus with 6 picograms of DNA?
    A. G0
    B. M
    C. G2
    D. G1
    E. S
    C. G2
    (this multiple choice question has been scrambled)
  9. The MPF protein complex turns itself off by
    A. exiting the cell
    B. activating the anaphase-promoting complex
    C. activating an enzyme that destroys cyclin
    D. activating an enzyme that stimulates cyclin
    E. binding to chromatin
    C. activating an enzyme that destroys cyclin
    (this multiple choice question has been scrambled)
  10. Proteins that are involved in the regulation of the cell cycle and that show fluctuations in concentration during the cell cycle are called
    A. ATPases
    B. cyclins
    C. kinetochores
    D. proton pumps
    E. centrioles
    B. cyclins
    (this multiple choice question has been scrambled)

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