Multiple Choice Questions

Are the sister chromatids present in all or part of this phase?
  • G1- noS- noG2- noBeginning of M- yesEnd of M- yes
  • The treated cancer cells are arrested at the G1 phase.
  • G1- noS- yesG2- yesBeginning of M- yesEnd of M- yes
  • G1- noS- yesG2- yesBeginning of M- yesEnd of M- no
Which of the following is true of benign tumors but not malignant tumors?
  • They have uncoiled to form long, thin strands.
  • They remain confined to their original site.
  • The treated cancer cells are arrested at the G1 phase.
  • Duplicated chromosomes attach to the plasma membrane.
In some organisms, such as certain fungi and algae, cells undergo the cell cycle repeatedly without subsequently undergoing cytokinesis. What would result from this?
  • Large cells containing many nuclei.
  • Region C
  • Region A: G1Region B: SRegion C: G2
  • They remain confined to their original site.
The data are plotted in a type of graph called a histogram, which groups values for a numeric variable on the x-axis into intervals. A histogram allows you to see how an entire group of experimental subjects (cells, in this case) are distributed along a continuous variable (amount of fluorescence). In these histograms, the bars are so narrow that the data appear to follow a curve for which you can detect peaks and dips. Each bar represents the number of cells observed to have a fluorescence level in that interval. This in turn indicates the relative amount of DNA in those cells.Which axis indirectly shows the relative amount of DNA per cell? By what relationship?
  • the x-axis; the DNA was stained, so there is a positive correlation between fluorescence and DNA content.
  • The treated glioblastoma cells were cultured in the presence of an inhibitor from umbilical cord stem cells, but the control cells were cultured without the inhibitor.
  • The treated cancer cells are arrested at the G1 phase.
  • a. Non-dividing cells exit cell cycle.b. At this point, cell commits to go through the cycle.c. DNA replicatesd. Two centrosomes have formed.e. Mitotic spindle begins to form.f. Cell divides, forming two daughter cells.
Is the DNA condensed in all or part of this phase?
  • The treated cancer cells are arrested at the G1 phase.
  • G1- noS- yesG2- yesBeginning of M- yesEnd of M- no
  • G1- noS- noG2- noBeginning of M- yesEnd of M- yes
  • G1- noS- yesG2- yesBeginning of M- yesEnd of M- yes
The _______________ are the organizing centers for microtubules involved in separating chromosomes during mitosis.
  • Mitotic spindle(s)
  • centromere(s)
  • Interphase
  • Centrosome(s)
During mitosis, microtubules attach to chromosomes at the ________________.
  • The mitotic phase
  • Interphase
  • centromere(s)
  • kinetochore(s)
__________ is a carcinogen that promotes colon cancer
  • Fat
  • .
  • Centrosome(s)
  • Interphase
The cell cycle represents the coordinated sequence of events in the life of a cell from its formation to its division into two daughter cells. Most of the key events of the cell cycle are restricted to a specific time within the cycle.In this exercise, you will identify when various events occur during the cell cycle. Recall that interphase consists of the G1, S, and G2 subphases, and that the M phase consists of mitosis and cytokinesis.Drag each label to the appropriate target.
  • a. Non-dividing cells exit cell cycle.b. At this point, cell commits to go through the cycle.c. DNA replicatesd. Two centrosomes have formed.e. Mitotic spindle begins to form.f. Cell divides, forming two daughter cells.
  • No; the DNA content per cell changes as the S phase progresses, the cells in S phase have a range of fluorescence levels.
  • G1- noS- yesG2- yesBeginning of M- yesEnd of M- yes
  • the x-axis; the DNA was stained, so there is a positive correlation between fluorescence and DNA content.
Which of these is NOT a carcinogen?
  • All of the above are carcinogens (UV light, fat, cigarette smoke, testosterone)
  • They remain confined to their original site.
  • Duplicated chromosomes attach to the plasma membrane.
  • The treated cancer cells are arrested at the G1 phase.
DNA replication produces two identical DNA molecules, called ____________, which separate during mitosis.
  • sister chromatid(s)
  • Interphase
  • kinetochore(s)
  • Chromatin
Which mechanism is the best explanation for how the stem cell-derived inhibitor might arrest the cancer cell cycle at the G1 stage?
  • The treated cancer cells are arrested at the G1 phase.
  • They remain confined to their original site.
  • The inhibitor might block the activity of a cyclin or signaling molecule of the G1 checkpoint.
  • No; the DNA content per cell changes as the S phase progresses, the cells in S phase have a range of fluorescence levels.
In dividing cells, most of the cell's growth occurs during ______________
  • Cytokinesis
  • kinetochore(s)
  • sister chromatid(s)
  • Interphase
Why is it difficult to observe individual chromosomes with a light microscope during interphase?
  • They have uncoiled to form long, thin strands.
  • They remain confined to their original site.
  • Duplicated chromosomes attach to the plasma membrane.
  • The treated cancer cells are arrested at the G1 phase.
In the control sample, compare the peaks in the histogram in regions A, B, and C.Which region shows the population of cells with the highest amount of DNA per cell?
  • No; the DNA content per cell changes as the S phase progresses, the cells in S phase have a range of fluorescence levels.
  • Large cells containing many nuclei.
  • Chromatin
  • Region C
In the control sample histogram, does the population of cells in the S phase show a distinct peak? Why or why not?
  • Region C
  • No; the DNA content per cell changes as the S phase progresses, the cells in S phase have a range of fluorescence levels.
  • The treated glioblastoma cells were cultured in the presence of an inhibitor from umbilical cord stem cells, but the control cells were cultured without the inhibitor.
  • The treated cancer cells are arrested at the G1 phase.
Which of the following ifs found in binary fission but not in mitosis?
  • The treated cancer cells are arrested at the G1 phase.
  • They remain confined to their original site.
  • Duplicated chromosomes attach to the plasma membrane.
  • All of the above are carcinogens (UV light, fat, cigarette smoke, testosterone)
What does the difference in distribution tell you about the cells in the treated sample?
  • The treated glioblastoma cells were cultured in the presence of an inhibitor from umbilical cord stem cells, but the control cells were cultured without the inhibitor.
  • The treated cancer cells are arrested at the G1 phase.
  • They remain confined to their original site.
  • Duplicated chromosomes attach to the plasma membrane.
During interphase, most of the nucleus is filled with a complex of DNA and protein in a dispersed form called ______________.
  • Interphase
  • Chromatin
  • Cytokinesis
  • The mitotic phase
What treatment is being compared to the control in the experiment?
  • The treated glioblastoma cells were cultured in the presence of an inhibitor from umbilical cord stem cells, but the control cells were cultured without the inhibitor.
  • They remain confined to their original site.
  • The treated cancer cells are arrested at the G1 phase.
  • No; the DNA content per cell changes as the S phase progresses, the cells in S phase have a range of fluorescence levels.
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Multiple Choice Questions
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