Investing Organisms Unit 9

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autotroph

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An organism that is able to form nutritional organic substances from simple inorganic substances such as carbon dioxide.

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cell

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The smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane.

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cell theory

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A scientific theory which describes the properties of cells, the basic unit of structure in every living thing.

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eukaryote

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An organism consisting of a cell or cells in which the genetic material is DNA in the form of chromosomes contained within a distinct nucleus.

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heterotroph

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An organism deriving its nutritional requirements from complex organic substances.

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multicellular

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An organism or part having or consisting of many cells.

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organism

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An individual animal, plant, or single-celled life form.

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prokaryote

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A microscopic single-celled organism that has neither a distinct nucleus with a membrane nor other specialized organelles.

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unicellular

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An organism that consists of a single cell.

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variation

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The occurrence of an organism in more than one distinct color or form.