Understanding Cell Theory

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Definition of Cell Theory

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A scientific theory describing the properties of cells, the basic unit of life.

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Key Concept: Basic Unit

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Cells are the basic unit of structure and function in living organisms.

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Important Scientist: Robert Hooke

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First to observe cells in 1665 using a microscope.

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Cell Theory Principle: All Living Things

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All living things are composed of one or more cells.

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True or False: Cells arise from non-living matter.

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False. Cells arise from pre-existing cells.

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Quiz: Who proposed that all plants are made of cells?

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Matthias Schleiden

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Key Concept: Cell Function

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Cells are the smallest unit of life that can perform all life processes.

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Important Scientist: Theodor Schwann

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Proposed that all animals are made of cells.

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Cell Theory Principle: Cell Division

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New cells are produced from existing cells through cell division.

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True or False: Viruses are considered living cells.

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False. Viruses are not considered living cells.