Assignment 9 Quiz

Last Updated By JanetMayorga on 12/08/2012
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_____ is a carcinogen that promotes colon cancer.

Answer:
a)  fat
b)  UV light
c)  estrogen
d)  a virus
e)  testosterone
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  • Answered in Assignment 9 Quiz

    Cells that are in a nondividing state are in which phase?


    a)G2
    b)G0
    c)G1
    d)M
    e)S
    b)S
  • Answered in Assignment 9 Quiz

    Which of the following triggers the cell's passage past the G2 checkpoint into mitosis?


    a)Cdk
    b)PDGF
    c)cyclin
    d)MPF
    e)protein kinase
    d)protein kinase
  • Answered in Assignment 9 Quiz

    Proteins that are involved in the regulation of the cell cycle, and that show fluctuations in concentration during the cell cycle, are called


    a)centrioles.
    b)proton pumps.
    c)kinetochores.
    d)ATPases.
    e)cyclins.
    e)cyclins.
  • Answered in Assignment 9 Quiz

    What event triggers a go-ahead signal for the M phase checkpoint?


    a)Kinetochores of all chromosomes are attached to the spindle.
    b)Alignment of all chromosomes along the metaphase plate.
    c)Chromosomal replication is successfully completed.
    d)Migration of centrosomes to opposite poles of the cell.
    e)Binding of growth factor to cell surface receptor.
    a)Binding of growth factor to cell surface receptor.
  • Answered in Assignment 9 Quiz

    Which of the following is a function of meiosis but not mitosis in eukaryotes?


    a)production of animal gametes
    b)cell replacement
    c)asexual reproduction
    d)repair of damaged organs
    e)growth
    a)growth
  • Answered in Assignment 9 Quiz

    A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. How many chromatids does it contain?


    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
    c)46 or 92, depending on the portion of prophase examined
  • 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
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Assignment 9 Quiz
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Free Quiz Question From Assignment 9 Quiz
Question: _____ is a carcinogen that promotes colon cancer.
Answer:
fat
UV light
estrogen
a virus
testosterone