Assignment 9 Quiz

Last Updated By JanetMayorga on 12/08/2012
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A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How many chromatids does it contain?

Answer:
a)  23
b)  46
c)  92
d)  23 or 46, depending on the portion of prophase examined
e)  46 or 92, depending on the portion of prophase examined
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  • Answered in Assignment 9 Quiz

    It is difficult to observe individual chromosomes with a light microscope during interphase because _____.


    a)sister chromatids do not pair up until division starts
    b)they have uncoiled to form long, thin strands
    c)the DNA has not been replicated yet
    d)they leave the nucleus and are dispersed to other parts of the cell
    e)the spindle must move them to the metaphase plate before they become visible
    b)the spindle must move them to the metaphase plate before they become visible
  • Answered in Assignment 9 Quiz

    The kinetochores _____.


    a)are located at the center of the centrosome; their function is to organize tubulin into elongated bundles called spindle fibers
    b)attach to the ring of actin along the cytoplasmic surface of the plasma membrane, causing the actin to contract to form the cleavage furrow
    c)are the primary centromere structures that maintain the attachment of the sister chromatids prior to mitosis
    d)are sites at which microtubules attach to chromosomes
    e)of each spindle interdigitate at the cell's equator and then move apart, causing the cell to elongate
    d)of each spindle interdigitate at the cell's equator and then move apart, causing the cell to elongate
  • Answered in Assignment 9 Quiz

    Which of the following correctly matches a phase of the cell cycle with its description?


    a)S: immediately precedes cell division
    b)G2: cell division
    c)M: duplication of DNA
    d)G1: follows cell division
    e)All of the above are correctly matched.
    d)All of the above are correctly matched.
  • Answered in Assignment 9 Quiz

    In some organisms such as certain fungi and algae, cells undergo the cell cycle repeatedly without subsequently undergoing cytokinesis. What would result from this?


    a)a rapid rate of gamete production
    b)a decrease in chromosome number
    c)inability to duplicate DNA
    d)large cells containing many nuclei
    e)division of the organism into many cells, most lacking nuclei
    d)division of the organism into many cells, most lacking nuclei
  • Answered in Assignment 9 Quiz

    Which of the following is/are difference(s) between the fission of a bacterium and mitosis in human cells?


    a)Human chromosomes are larger and more complex.
    b)Bacteria are smaller and simpler than human cells.
    c)Duplicated bacterial chromosomes attach to the plasma membrane. Duplicated human chromosomes are attached to each other.
    d)A bacterium has only one chromosome, human chromosomes are paired.
    e)All of the above are differences between the fission of a bacterium and human cell division.
    e)All of the above are differences between the fission of a bacterium and human cell division.
  • Answered in Assignment 9 Quiz

    Cytochalasin B is a chemical that disrupts microfilament formation. This chemical would interfere with _____.


    a)binary fission
    b)cleavage
    c)formation of the cell plate
    d)DNA replication
    e)formation of the mitotic spindle
    b)formation of the mitotic spindle
  • Answered in Assignment 9 Quiz

    Cells will usually divide if they receive the proper signal at a checkpoint in the _____ phase of the cell cycle.


    a)G1
    b)S
    c)G2
    d)cytokinesis
    e)M
    a)M
  • Answered in Assignment 9 Quiz

    A benign tumor, but not a malignant tumor, is one in which the cancerous cells _____.


    a)have an unusual number of chromosomes
    b)can divide indefinitely if an adequate supply of nutrients is available
    c)are the result of the transformation of normal cells
    d)remain confined to their original site
    e)migrate from the initial site of transformation to other organs or tissues
    d)migrate from the initial site of transformation to other organs or tissues
  • Answered in Assignment 9 Quiz

    Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei re-forming on either side of the cell plate. This cell is most likely


    a)an animal cell in the S phase of the cell cycle.
    b)a plant cell in the process of cytokinesis.
    c)a bacterial cell dividing.
    d)an animal cell in the process of cytokinesis.
    e)a plant cell in metaphase.
    b)a plant cell in metaphase.
  • Answered in Assignment 9 Quiz

    Vinblastine is a standard chemotherapeutic drug used to treat cancer. Because it interferes with the assembly of microtubules, its effectiveness must be related to


    a)inhibition of regulatory protein phosphorylation.
    b)suppression of cyclin production.
    c)disruption of mitotic spindle formation.
    d)inhibition of DNA synthesis.
    e)myosin denaturation and inhibition of cleavage furrow formation.
    c)myosin denaturation and inhibition of cleavage furrow formation.
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Assignment 9 Quiz
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Free Quiz Question From Assignment 9 Quiz
Question: A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How many chromatids does it contain?
Answer:
23
46
92
23 or 46, depending on the portion of prophase examined
46 or 92, depending on the portion of prophase examined