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| in biology, the smallest unit that can perform all life processes. |
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| the theory that states that all living things are made up of one or more cells, that cells are basic units of organisms, that each cell in a multicellular organism has a specific job, and that cells come only from existing cells. |
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| or cell membrane, the cells outer body. |
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| the region of the cell within the membrane that includes the fluid, the cytoskeleton, and all the organelles except the nucleus. |
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| the soluble portion of the cytoplasm, which includes molecules and small particles, such as ribosomes, but not the organelles covered with membranes. |
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| in physical science, an atoms central region, which is made up of proteins and neutrons. |
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