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| Consisting of a single cell. |
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| having or consisting of many cells. |
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| an optical instrument used for viewing very small objects, such as mineral samples or animal or plant cells, typically magnified several hundred times. |
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| the semipermeable membrane surrounding the cytoplasm of a cell. Also called cytomembrane . |
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| the material or protoplasm within a living cell, excluding the nucleus. |
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the central and most important part of an object, movement, or group, forming the basis for its activity and growth : the nucleus of a film-producing industry.
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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. Eukaryotes include all living organisms other than the eubacteria and archaebacteria. Compare with prokaryote . |
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a microscopic single-celled organism, including the bacteria and cyanobacteria, that has neither a distinct nucleus with a membrane nor other specialized organelles. Compare with eukaryote .
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any of a number of organized or specialized structures within a living cell.
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| A rigid layer of polsaccharides lying outside the plasma membrane of the cellss of plants, fungi, and bacteria. |
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| (in green plant cells) a plastid that contains chlorophyll and in which photosynthesis takes place. |
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| an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner layer being folded inward to form layers (cristae). |
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| a space or vesicle within the cytoplasm of a cell, enclosed by a membrane and typically containing fluid. |
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| a network of membranous tubules within the cytoplasm of a eukaryotic cell, continuous with the nuclear membrane. It usually has ribosomes attached and is involved in protein and lipid synthesis. |
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| a minute particle consisting of RNA and associated proteins, found in large numbers in the cytoplasm of living cells. They bind messenger RNA and transfer RNA to synthesize polypeptides and proteins. |
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| Any of the distinct types of material of which animals or plants are made, consisting ofspecialized cells and their products. |
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| A part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans. |
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