EOC Cell Cycle & Viruses

The activities in the cell cycle occur during specific phases. In which phase of the cell cycle is DNA replicated?

• Mitosis

• G1 phase

• G2 phase

• S phase

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

• Arrow 1 represents Prophase, and Arrow 2 represents Interphase

• Arrow 1 represents Mitosis, and Arrow 2 represents Meiosis

• Arrow 1 represents Interphase, and Arrow 2 represents Mitosis

• Arrow 1 represents Meiosis, and Arrow 2 represents Prophase

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Part of the cell cycle is shown in this simplified model. This part of the cell cycle is best described as the process that -

• duplicate the DNA

• complete cell division

• maintains genetic homeostasis

• synthesizes new molecules

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People who have leukemia, a cancer that affects white blood cells, are often given Cytarabine. This drug inhibits the synthesis of DNA. Which phase of the cell cycle is most affected by Cytarabine?

• G1 phase

• S phase

• G2 phase

• M phase

The diagram shows cells in different phases of mitosis. A student is trying to find a cell in a particular phase of mitosis. The 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

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

• I

• II

• III

• IV

Scientists can bioengineer skin in a laboratory to treat severe burns and other types of skin injuries. This bioengineered tissue is grown from living cells. The cellular process that enables the cells to grow and develop into tissue is -

• conjugation

• meiosis

• budding

• mitosis

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Checkpoints occur between the stages of the cell cycle. If a cell does not meet certain criteria at the end of the stage, it will not move to the next stage. Which of these occurs just before the cell enters the G2 stage of the cell cycle?

• The nuclear membrane disintegrates

• DNA replicates

• Centrioles form

• The nucleolus divides

Telophase is a stage of a cellular process that begins after the chromosomes have moved to opposite poles of the cell. During which cellular process does telophase occur?

• Translation

• Interphase

• Transcription

• Mitosis

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