Cell Division

The diagram shows cells in different phases of mitosis. A student is looking for evidence that spindle fibers are separating the chromosomes to ensure that each new nucleus has one copy of each chromosome. Which cell is in the phase of mitosis that the student is searching for?

• Cell 1

• Cell 2

• Cell 3

• Cell 4

The diagram shows the cell cycle. The label "interphase" has been omitted from this model. Which best describes how the term "interphase" could be correctly added?

• Add the term with an arrow pointing to the G1, S, and G2 stages.

• Add the term with arrows pointing to both the G1 and G2 stages.

• Add the term with arrows pointing to both mitosis and cytokinesis.

• Add the term with an arrow pointing only to the S stage.

A cell cycle checkpoint would be best described as--

• any step where the cell cycle is blocked by a mutated protein

• specific stages where further progress of the cell cycle can be halted

• either G1, S, G2, prophase, metaphase, anaphase or telophase

• a site in the cytoplasm where proteins are inspected for mutations

The figure shows the muscle cells and neurons (nerve cells) have the same DNA. However, in each type of cell, only specific parts of the DNA are activated. What is the best term to describe this process?

• Diffusion

• Cytokinesis

• Differentiation

• Interphase

The model represents the change in the amount of DNA in a cell during the cell cycle. Which part of the model represents the S phase?

• I

• II

• III

• IV

A cell that undergoes repeated mitosis without cytokinesis would have--

• Cancerous properties

• Multiple nuclei

• Fewer chromosomes

• Multiple daughter cells

Normal cells become cancer cells when--

• Cells continue to divide without passing through checkpoints

• Cells do not respond normally to control mechanisms

• Regulation of cell growth and division is lost

• All of the above

The images are taken from microscopes. How can you determine the type of cell based on the image?

• Cell B is a plant cell because it has a cell membrane.

• Cell A is an animal cell because it has a cleavage furrow.

• Cell B is a plant cell because it has 2 nuclei.

• Cell A is an animal cell because it is dividing.

When cell divide too rapidly, it leads to the development of--

• Cell walls

• Gametes

• Stem cells

• Tumors

Which statement accurately describes how the growth of a tumor and the repair of a scrape on your knee are similar?

• Both involve breakdowns in the cell cycle.

• Both have negative effects on the body

• Both are caused by faulty signals.

• Both involve rapid cell division.