What are the postulates of the cell theory?
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The three tenets to the cell theory are as described below: All living organisms are composed of one or more cells. The cell is the basic unit of structure and organization in organisms. Cells arise from pre-existing cells.
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The three classical postulates of cell theory are:
1.All known life iscomposed of one or more cells. (Note thatsince viruses are not made out of cells, according to cell theory viruses and other things that replicate autonomously such as prions are not alive. This is controversial, since viruses in particular exhibit other characteristics of living things.)
2.Cells are the building blocks of organisms. Anything simpler than a cell cannot survive and replicate to produce more cells on its own.Therefore, cells are the fundamental unit of life, eventhough the inner workings of cells are verycomplex.
3.Cells come from other cells. This means that a cell cannot arise spontaneously but has to be copied from a preexisting cell.Modern biologists added additional postulates, but the original three have endured.
1.All known life iscomposed of one or more cells. (Note thatsince viruses are not made out of cells, according to cell theory viruses and other things that replicate autonomously such as prions are not alive. This is controversial, since viruses in particular exhibit other characteristics of living things.)
2.Cells are the building blocks of organisms. Anything simpler than a cell cannot survive and replicate to produce more cells on its own.Therefore, cells are the fundamental unit of life, eventhough the inner workings of cells are verycomplex.
3.Cells come from other cells. This means that a cell cannot arise spontaneously but has to be copied from a preexisting cell.Modern biologists added additional postulates, but the original three have endured.
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