Cell Theory & Cell Diversity

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4 Terms

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What is the cell?

The structural and functional unit of life

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What dictates the biochemical activities of cells?

Their shapes/forms and specific subcellular structures

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What are the four main concepts of the Cell Theory?

  1. Cells are the building blocks of all plants and animals

  2. Cells are the smallest functioning units of life

  3. Cells are produced through the division of preexisting cells

  4. Each cell maintains homeostasis

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How do cells vary in size and shape?

They range from microscopic erythrocytes (7-8 μm) to large oocytes (120 μm); shapes can be spherical, cubelike, columnlike, cylindrical, disc-shaped, or irregular