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| In biology, the smallest unit that can perform all life processes; cells are covered by a membrane and contain DNA and cytoplasm. |
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| A phospholipid layer that covers a cells surface and acts as a barrier between the inside of a cell and a cell's environment. |
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| One of the small bodies in a cells cytoplasm that are specialized to perform a specific function. |
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| In a eurkaryotic cell, a membrane-bound organelle that contains the cell's DNA and that has a role in processes such as growth, metabolism, and reproduction. |
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| An organism that consists of a single cell that does not have a nucleus. |
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| An organism made up of cells that have a nucleus enclosed by a membrane; eukaryotes include animals, plants, and fungi but not archaebacteria or eubacteria. |
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