Unit 4: Cell Cycle and DNA Replication

Reorder the following phases of mitosis:

• 
• 
• 
• 

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112.34.c.5.A

Label the phases in the image shown.

c

d

e

f

cytokinesis

telophase

metaphase

anaphase

prophase

interphase

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112.34.c.5.A

A student studying mitosis captures an image of cells from an onion root tip with a camera mounted on a microscope. Which events occur after the phase circled in the student's image?

• chromosomes condense

• paired chromosomes separate

• the nuclear membrane disappears

• chromosomes attach to spindle fibers

• the cytoplasm separates into two cells

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112.34.c.5.A

A student studying mitosis captures an image of cells from an onion root tip with a camera mounted on a microscope. Which events occur before the phase circled in the student's image?

• chromosomes condense

• paired chromosomes separate

• the nuclear membrane disappears

• chromosomes attach to spindle fibers

• the cytoplasm separates into two cells

Tags

112.34.c.5.A

Scientists determined the total mass of DNA from a sample of animal cells. The masses of equal number of cells were taken during three different stages of the cell cycle. Stage I contains cells massed during G1 of the cell cycle.

 

Using the graphic below, indicate which stage is described by the statement:

 

"The cells have replicated their DNA, but have not completed mitosis and cytokinesis."

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112.34.c.5.A

The model of the cell cycle includes two arrows that represent a process in the cycle.

Fill in the blanks to describe the two arrows.

Arrow 1 represents -

Arrow 2 represents -

d

e

cytokinesis

anaphase

telophase

mitosis

prophase

metaphase

interphase

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112.34.c.5.A

Cells pass through a G₂ checkpoint before entering mitosis. Ideally, if DNA damage is detected, the cells do not enter mitosis until the damage is repaired. Why is DNA damage repaired before cells enter mitosis?

• So that another round of DNA synthesis does not have to take place

• So that the chromosomes can align at the metaphase plate during mitosis

• So that the cytoplasm can be divided equally between the two daughter cells

• So that healthy daughter cells are produced, allowing the organism to continue growing

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112.34.c.5.A

Which of these properties is found only in cancer cells?

• Unregulated cell division

• Regulated gene expression

• Response to signals outside of the cell

• Presence of mitochondria

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112.34.c.5.C

Which of these is MOST LIKELY an indication that cells may have become cancerous?

• Cells undergoing slower rates of mitosis

• Cells with few or no mutations

• Cells not responding to checkpoints in the cell cycle

• Cells with decreased rates of protein synthesis

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112.34.c.5.C

Normal cells have a contact inhibition feedback mechanism that prevents the cells from replicating when other cells are touched. A diagram of cells with contact inhibition and cells without contact inhibition is shown. 

Which statement best describes what will happen to cells in an organism that lack contact inhibition?

• The cells will continue to grow, causing a tumor in the body.

• The cells will replicate normally, replacing body cells that die.

• The cells will replicate until the food supply for each cell is used, causing each cell to die.

• The cells will stop replicating once one layer is produced, as other body cells will crowd them out.

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112.34.c.5.C