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  1. en.wikipedia.org › wiki › Cell_theoryCell theory - Wikipedia

    Once this tenet was added, the classical cell theory was complete. Modern interpretation. The generally accepted parts of modern cell theory include: All known living things are made up of one or more cells; All living cells arise from pre-existing cells by division. The cell is the fundamental unit of structure and function in all living ...

  2. Cell theory has its origins in seventeenth century microscopy observations, but it was nearly two hundred years before a complete cell membrane theory was developed to explain what separates cells from the outside world. By the 19th century it was accepted that some form of semi-permeable barrier must exist around a cell.

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