Unit 2 Biology Terms

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Cell

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The basic structural, functional, and biological unit of all known living organisms.

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Cell Theory

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A scientific theory which describes the properties of cells.

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Nucleus

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A membrane-bound organelle that contains the cell's chromosomes.

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Nuclear Envelope

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A double membrane that encloses the nucleus in eukaryotic cells.

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Nucleolus

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A region within the nucleus involved in the production of ribosomes.

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Eukaryote

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An organism whose cells contain a nucleus and other organelles enclosed within membranes.

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Prokaryote

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A unicellular organism that lacks a membrane-bound nucleus.

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Organelle

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A specialized subunit within a cell that has a specific function.

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Cytoplasm

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The material within a cell, excluding the nucleus.

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Deoxyribonucleic Acid

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The molecule that carries genetic instructions in all living things.