Onion Root Tip Mitosis

What is a cell doing during interphase? check all that apply

• resting

• copying DNA

• growing

• dividing

• cellular respiration

What is the approximate % of time most healthy cells spend in interphase?

• 5%

• 10%

• 50%

• 75%

• 90%

What is the main purpose of mitosis?

• to create two new cells that are different from the parent cell

• the create two new cells that are the same as the parent cell

• to copy the DNA

• to perform normal, cellular operations

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A student is examining an onion root tip cell under a microscope. Based on her observations, the student proposes that the onion root tip cell has completed interphase and is now in the first phase of mitosis.

Which of the following pieces of evidence would best support the student’s claim?

• The DNA is not visible.

• Separated sister chromatids are being pulled towards opposite ends of the cell.

• The DNA is beginning to condense and become visible.

• The cell’s chromosomes are aligned across the metaphase plate.

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The following graph shows how cellular DNA content changes over the course of a typical mitotic cell cycle in rapidly proliferating human cells.

Based on the graph, which of the following statements is correct?

• The amount of cellular DNA remains constant throughout the cell cycle.

• The amount of cellular DNA is halved during interphase.

• Human cells spend the same amount of time in M phase as they do in interphase.

• Human cells spend the majority of the cell cycle in interphase.

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A mouse skin cell containing 40 chromosomes undergoes mitosis. This process results in the formation of

• four daughter cells, each with 40 chromosomes

• four daughter cells, each with 20 chromosomes

• two daughter cells, each with 40 chromosomes

• two daughter cells, each with 20 chromosomes

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Which phase of mitosis is this cell in?

• prophase

• metaphase

• anaphase

• telophase

• cytokinesis

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Which phase of mitosis is this cell in?

• prophase

• metaphase

• anaphase

• telophase

• cytokinesis

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DNA replicates during

• S phase of interpahse

• P phase of Mitosis

• G1 phase of interpahse

• G2 phase of interphase

Mitosis creates

• 2 cells with half the DNA

• 4 cells with half the DNA

• 2 Identical cells with equal DNA

• cancer

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