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4 Cards in this Set
- Front
- Back
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Cells are the structural units of living things.
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All organisms are made up of one or more cells and the
products of those cells. An organism may be a single cell. Examples are protozoa (ameba, paramecium, and bacteria). In many celled organisms, there may be intercellular material made by the cells. |
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Cells are the functional units of living things.
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All cells carry on their own life activities. The life activities of a many-celled organism are the combined effects of the activities of its individual cells. This is where you can say “You are not alive, your cells are alive”
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New Cells can arise only from other living cells by the process of cell division or reproduction.
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Reproduction of a many –celled organism is brought about by reproduction of certain of its cells.
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Exceptions to the Cell Theory.
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There are several biological facts that are not explained y the cell
theory. Although the cell is considered the basic unit of organisms, some structures inside the cell – the mitochondrion and the chloroplast – have their own DNA and can duplicate themselves. The cell is not the basic structural unit of such organisms as the slime mold and bread molds. These organisms generally consist of a mass of cytoplasm with many nuclei and no distinct cells. Skeletal muscle tissue also contains many nuclei not separated by cell membranes. |
