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Lec4 - Cell Theory Every organism is composed of one or...

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Cell Theory Every organism is composed of one or more cells. The cell is the smallest unit having the properties of life. All cells come from pre-existing cells. Robert Hooke in 1665 examined very thin slices of cork and saw a The first to witness a live cell under a microscope was Antonie van Leeuwenhoek who in 1674 described the very thin slices of cork and saw a multitude of tiny pores that he remarked looked like the walled compartments (cells) a monk would live in. , who in 1674 described the algae Spirogyra . In 1839, Schwann and Schleiden suggested that cells were the basic unit of life. In 1855, Rudolf Virchow concluded that all cells come from pre- existing cells
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