Interphase

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9 Terms

1
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Why do cells need to divide?

To replace dead or damaged cells, for growth of an organism, for repair of body tissue, and for reproduction (e.g., production of gametes).

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Interphase

The longest stage of cell division, comprising 90% of the cell cycle, during which the cell nucleus is visible.

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G1 phase

The growth phase in interphase where the cell grows.

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S phase

The synthesis phase in interphase where DNA replication occurs.

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G2 phase

The preparation phase in interphase where organelles are copied in preparation for cell division.

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Nucleosome

A structure formed when DNA coils around histone proteins.

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Chromatin

The structure formed by nucleosomes that coils to form chromosomes.

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Somatic cells

Body cells that contain 46 chromosomes.

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Gametes

Reproductive cells (sperm and eggs) that contain 23 chromosomes.