Mitosis and Cell Cycle

Describe the events that occur during telophase of mitosis.

• During telophase, the chromosomes begin to de-condense back into chromatin, the nuclear envelope re-forms around each set of chromosomes, and the cell prepares for cytokinesis.

• During telophase, the chromosomes are pulled apart to opposite poles of the cell, and the spindle fibers begin to break down.

• During telophase, the cell undergoes DNA replication, resulting in two identical sets of chromosomes.

• During telophase, the cell membrane invaginates to form two separate daughter cells, completing the process of mitosis.

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What are chromatids and how do they relate to chromosomes?

• Chromatids are the two identical halves of a duplicated chromosome, joined together at the centromere.

• Chromatids are the original form of chromosomes before they duplicate.

• Chromatids are a type of RNA that helps in protein synthesis.

• Chromatids are the structures that form during cell division to separate the nucleus.

What is the importance of genetic variation in meiosis?

• It ensures that all gametes are genetically identical.

• It allows for the production of gametes with different combinations of alleles, contributing to diversity in a population.

• It prevents mutations from occurring during cell division.

• It is primarily important for the repair of DNA damage.

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Oncogene

• a gene that may contribute to tumor growth, and in turn, cause cancer; can stimulate signaling that encourages continuation through the cell cycle

• a gene that suppresses tumor growth and prevents cancer

• a gene that has no effect on cell growth or cancer

• a gene that repairs DNA damage and maintains genomic stability

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How do checkpoints function in the cell cycle?

• Checkpoints are mechanisms that ensure the cell cycle progresses only when certain conditions are met, preventing errors in DNA replication and cell division.

• Checkpoints are random points in the cell cycle where cells can divide without regulation.

• Checkpoints are stages in the cell cycle that allow for rapid cell division regardless of DNA integrity.

• Checkpoints are processes that promote uncontrolled cell growth and division.

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What is the significance of the G1 phase in the cell cycle?

• It is the phase where DNA is replicated.

• It is the first gap phase where the cell grows, synthesizes proteins, and prepares for DNA replication.

• It is the phase where the cell divides into two daughter cells.

• It is the phase where the cell undergoes apoptosis.

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What are the main phases of the cell cycle?

• Interphase (G1, S, G2) and Mitosis (Prophase, Metaphase, Anaphase, Telophase), followed by Cytokinesis

• Interphase and Cytokinesis only

• Mitosis only

• G1, S, G2, and Cytokinesis

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What happens during prophase of mitosis?

• The chromatin condenses into visible chromosomes, the nuclear envelope breaks down, and the spindle apparatus begins to form.

• The chromosomes align at the cell's equator and are attached to spindle fibers.

• The nuclear envelope re-forms around the separated chromosomes, and the cell prepares for cytokinesis.

• The DNA is replicated, and the cell prepares for the next phase of mitosis.

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Cancer

• uncontrolled cell growth; caused by disruptions of normal functioning of the cell cycle (often, cell cycle checkpoints) through mutations in DNA

• a condition characterized by excessive cell death and tissue degeneration

• a viral infection that leads to rapid cell division

• a genetic disorder that affects the body's ability to repair DNA

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What is a chromosome and what is its role in cell division?

• A chromosome is a structure made of RNA that carries genetic information.

• A chromosome is a structure made of DNA and protein that carries genetic information. During cell division, chromosomes ensure that DNA is accurately replicated and distributed to daughter cells.

• A chromosome is a type of protein that helps in the synthesis of DNA during cell division.

• A chromosome is a small organelle that helps in energy production during cell division.

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