Cell Cycle Disruptions

Which of the following would be an abnormal action during the cell cycle?

• Cells grow and develop during the G1 phase.

• Cells replicate DNA during the S phase.

• Cytokinesis partially splits a cell into two, resulting in a cell with two nuclei.

• Spindle fibers separate sister chromatids during mitosis

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NGSS.HS-LS1-4

Sometimes cells can become non-responsive to chemicals that control cell growth. As a result the cell cycle I disrupted and cells grow and divide uncontrollably. This results in a disease called-

• HIV

• Cancer

• Influenza

• E. coli

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NGSS.HS-LS1-4

Why are disruptions to the cell cycle potentially dangerous to an organism?

• It could specialize the produced cells for a specific function.

• It could result in the production of abnormal or nonfunctional cells.

• Cells may exit the cell cycle and enter the G0 phase.

• DNA may be replicated during the S phase.

Cancer cells are different from other cells because they are more likely to do which of the following within the cell cycle?

• Fail to complete S phase.

• Mutate during G1 phase.

• Repeat the cell cycle continuously.

• Die after completing mitosis.

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NGSS.HS-LS1-4

What could result if cells fail to recognize the chemicals that regulate the cell cycle?

• The cell cycle could become disrupted.

• The DNA will continue to regulate cell division.

• Mitosis will carry on at normal rates.

• All cells will enter and stay in S phase.

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NGSS.HS-LS1-4

Which of the following processes would a scientist trying to treat patients with cancer most likely target?

• The cell cycle of the patient.

• Homeostasis in the organism.

• Meiosis in the sex organs.

• Rate of cellular respiration.

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NGSS.HS-LS1-4

Why is regulation of the Cell Cycle important to the survival of organisms?

• It helps control cell growth and division.

• It prevents DNA from replicating at all times.

• It keeps all cells in G0 phase.

• It controls Cell differentiation.

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NGSS.HS-LS1-4

Cancerous cell can often develop a large mass of cells called a tumor. The tumor is the result of-

• A group of dead and dying cells.

• Inability of the immune system to kill pathogens.

• Uncontrolled cell division.

• Viral infections.

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NGSS.HS-LS1-4

• DNA replication moves in one direction

• each DNA strand serves as a template for a new strand

• old DNA breaks down and is recycled after a cell divides

• after cell division, damaged sections of the DNA are removed

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NGSS.HS-LS1-1

During which phase of the cell cycle is DNA replicated?

• S phase

• G1 phase

• M phase

• Cytokinesis