Cell growth and Cell cycle

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What is the cell cycle?

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The cell cycle is the series of phases that a cell goes through from its formation until it divides into two daughter cells. It includes interphase (G1, S, G2) and the mitotic phase (mitosis and cytokinesis).

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What happens during interphase?

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Interphase is the phase of the cell cycle where the cell grows, duplicates its DNA, and prepares for mitosis. It consists of three sub-phases: G1 (cell growth), S (DNA synthesis), and G2 (preparation for mitosis).

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What is mitosis?

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Mitosis is the process of cell division that results in two genetically identical daughter cells. It consists of several stages: prophase, metaphase, anaphase, and telophase.

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What are centrosomes?

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Centrosomes are organelles that serve as the main microtubule organizing centers in animal cells. They play a crucial role in cell division by helping to organize the spindle fibers that separate chromosomes.

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What are spindle fibers?

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Spindle fibers are structures made of microtubules that form during cell division. They attach to chromosomes and help pull them apart to ensure that each daughter cell receives the correct number of chromosomes.

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What is cytokinesis?

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Cytokinesis is the final stage of cell division, where the cytoplasm of a parental cell is divided into two daughter cells. It usually occurs after mitosis.

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What is the role of DNA during cell division?

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DNA carries the genetic information necessary for the growth, development, and functioning of living organisms. During cell division, DNA is replicated so that each daughter cell receives an identical set of chromosomes.

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What is the significance of the G1 phase?

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The G1 phase is the first sub-phase of interphase where the cell grows and synthesizes proteins necessary for DNA replication. It is crucial for preparing the cell for the next phase.

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What occurs during the S phase of interphase?

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During the S phase, DNA replication occurs, resulting in the duplication of chromosomes. Each chromosome now consists of two sister chromatids.

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What is the difference between prophase and metaphase?

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Prophase is the first stage of mitosis where chromosomes condense and become visible, and the nuclear envelope breaks down. Metaphase is the second stage where chromosomes align at the cell's equatorial plane.