Biology Terms

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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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a cell that contains a nucleus and membrane-bound organelles

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Prokaryote

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A unicellular organism that lacks a membrane-bound organelles.

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Cell Wall

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A rigid layer lying outside the plasma membrane of the cells of plants, fungi, and bacteria.

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Chloroplast

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a plastid containing chlorophyll; the site of photosynthesis

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Chromatin

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the DNA and proteins in the nucleus of a nondividing cell

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Chromosome

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A long DNA molecule with part or all of the genetic material of an organism. DNA and proteins in a coiled, rod-shaped form that occurs during cell division.

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Cilium

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A hair-like structure that extends from a cell and functions in locomotion or in the movement of substances across the cell surface.

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Crista

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The folds of the inner membrane of a mitochondrion.

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Cytoplasm

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the region of a cell between the cell membrane and the nucleus