Understanding the Cell Cycle and Mitosis

Which phase of the cell cycle is primarily responsible for the replication of DNA?

• G1 phase

• S phase

• G2 phase

• M phase

During which phase of mitosis do the chromosomes align at the center of the cell?

• Prophase

• Metaphase

• Anaphase

• Telophase

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NGSS.HS-LS1-4

Explain the role of spindle fibers during mitosis.

• They help in the replication of DNA.

• They attach to chromosomes and help separate them.

• They form the nuclear envelope.

• They dissolve the cell membrane.

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NGSS.HS-LS1-4

What is the main purpose of cytokinesis in the cell cycle?

• To replicate the cell's DNA

• To divide the cytoplasm and organelles into two daughter cells

• To align chromosomes in the center of the cell

• To condense chromatin into chromosomes

Describe how the cell cycle is regulated by checkpoints.

• Checkpoints ensure that the cell is ready to proceed to the next phase.

• Checkpoints stop the cell cycle permanently.

• Checkpoints only occur during mitosis.

• Checkpoints are responsible for DNA replication.

Which of the following is a key difference between mitosis and cytokinesis?

• Mitosis involves the division of the nucleus, while cytokinesis involves the division of the cytoplasm.

• Mitosis occurs after cytokinesis.

• Cytokinesis involves the alignment of chromosomes.

• Mitosis results in two identical cells, while cytokinesis results in four.

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NGSS.HS-LS1-4

Predict what might happen if spindle fibers fail to attach to chromosomes during mitosis.

• Chromosomes would not replicate.

• Chromosomes would not separate properly

• The nuclear envelope would not dissolve.

• Cytokinesis would not occur.

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NGSS.HS-LS1-4

In which phase of the cell cycle does the cell grow and perform its normal functions?

• G1 phase

• S phase

• G2 phase

• M phase

What is the significance of the G2 phase in the cell cycle?

• It is the phase where DNA is replicated.

• It is the phase where the cell prepares for mitosis.

• It is the phase where the cell divides.

• It is the phase where the cell exits the cycle.

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NGSS.HS-LS1-4

Analyze the consequences of a malfunction in the cell cycle regulation mechanisms.

• The cell would stop growing.

• The cell could become cancerous due to uncontrolled division.

• The cell would not be able to replicate DNA.

• The cell would not undergo cytokinesis.

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