The Cell Cycle
Dive Into The Cell Cycle
Test your knowledge about the fascinating process of the cell cycle! This quiz features 20 questions covering various aspects of cell division, including mitosis, cytokinesis, and the roles of different proteins and enzymes.
Challenge yourself and learn more about:
- Cancer cell characteristics
- Mitosis and cytokinesis in different organisms
- Key phases of the cell cycle
- Regulatory mechanisms of cell division
One difference between cancer cells and normal cells is that cancer cells
A. Are unable to synthesize DNA.
B. Are arrested at the S phase of the cell cycle.
C. Cannot function properly because they are affected by density-dependent inhibition.
D. Are always in the M phase of the cell cycle.
E. Continue to divide even when they are tightly packed together.
In the cells of some organisms, mitosis occurs without cytokinesis. This will result in
A. Cells lacking nuclei.
B. Cells that are unusually small.
C. Cells with more than one nucleus.
D. Cell cycles lacking an S phase.
E. Destruction of chromosomes.
Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei forming on either side of the cell plate. This cell is most likely
A. A bacterial cell dividing.
B. A plant cell in the process of cytokinesis.
C. An animal cell in the process of cytokinesis.
D. An animal cell in metaphase.
E. A plant cell in metaphase.
As a patch of scraped skin heals, the cells fill in the injured area but do not grow beyond that. This is an example of
A. Growth factor inhibition.
B. density-dependent inhibition.
C. density-independent inhibition.
D. anchorage-dependent inhibition.
E. Anchorage independence.
The drug cytochalasin B blocks the function of actin. Which of the following aspects of the animal cell cycle would be most disrupted by cytochalasin B?
A. Cell elongation during anaphase
B. Cleavage furrow formation and cytokinesis
C. DNA synthesis
D. Spindle formation
E. Spindle attachment to kinetochores
Increases in the enzymatic activity of some protein kinases important for the regulation of the cell cycle are due to
A. A decline in external growth factors to a concentration below the inhibitory threshold.
B. Kinase synthesis by ribosomes.
C. Cleavage of the inactive kinase molecules by cytoplasmic proteases.
D. Conversion of inactive cyclins to active kinases by means of phosphorylation.
E. Activation of inactive kinases by binding to cyclins.
Eukaryotic cells spend most of their cell cycle in which phase?
A. interphase
B. metaphase
C. anaphase
D. telophase
E. prophase
The decline of MPF activity at the end of mitosis is due to
A. Decreased synthesis of Cdk.
B. The destruction of the protein kinase Cdk.
C. The accumulation of cyclin.
D. The degradation of cyclin.
E. Synthesis of DNA.
The cell-cycle control system
A. Receives messages from outside the cell that influence cell division.
B. Includes three key checkpoints to complete a cell cycle.
C. Is influenced by growth factors that bind to cell receptors.
D. All of the choices are correct.
E. Triggers and controls major events in the cell cycle.
Which of the following does not occur during mitosis?
A. Disappearance of the nucleolus
B. Condensing of chromosomes
C. Synthesis of DNA
D. Separation of sister chromatids
E. Spindle formation
Which of the following are primarily responsible for cytokinesis in plant cells?
A. cyclin-dependent kinases
B. Actin and myosin
C. kinetochores
D. Golgi-derived vesicles
E. Centrioles and basal bodies
Sister chromatids are
A. Formed when chromatids separate during cell division.
B. Tightly linked together at a centromere.
C. Made only of DNA.
D. Unique to prokaryotes.
E. Found right after a cell divides.
A particular cell has half as much DNA as some other cells in a mitotically active tissue. The cell in question is most likely in
A. prophase.
B. metaphase.
C. G1.
D. anaphase.
E. G2.
The process by which the cytoplasm of a eukaryotic cell divides to produce two cells is called
A. Spindle formation.
B. cytokinesis.
C. mitosis.
D. telophase.
E. Binary fission.
A benign tumor differs from a malignant tumor in that a benign tumor
A. Never causes health problems.
B. Can only arise in the brain, whereas a malignant tumor can arise anywhere in the body.
C. Spreads from the original site.
D. Does not metastasize.
E. Is cancerous.
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. Disruption of mitotic spindle formation.
B. Inhibition of regulatory protein phosphorylation.
C. Suppression of cyclin production.
D. Myosin denaturation and inhibition of cleavage furrow formation.
E. Inhibition of DNA synthesis.
The creation of offspring carrying genetic information from a single parent is called
A. Asexual reproduction.
B. None of the choices are correct.
C. Life cycle.
D. Sexual reproduction.
E. regeneration.
The phase of mitosis during which the nuclear envelope fragments and the nucleoli disappear is called
A. interphase.
B. telophase.
C. metaphase.
D. anaphase.
E. prophase/prometaphase.
A cell containing 92 chromatids at metaphase of mitosis would, at its completion, produce two nuclei containing how many chromosomes?
A. 46
B. 92
C. 23
D. 16
E. 12
Which of the following help maintain the structure of chromosomes and control the activity of genes?
A. The nuclear membrane
B. ribosomes
C. lipids
D. centrosomes
E. Proteins
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