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AS - applied science unit 1 biology (btec)
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Prokaryotic cell Cell that does not have a nucleus or other membrane-bound organelles. Magnification The number of times larger an image is compared with the real size of the object ... 00:05 01:01 1665 Robert Hooke first described cells 1674-1683 The first living cell was observed: Anton van Leeuwenhoek was the first person to observe bacteria and protoctista from pond water samples, after developing powerful glass lenses. 1831 Nucleus observed: Robert Brown, an English botanist was the first to observe and describe the nucleus in a plant cell. 1839 Universal cell theory: Matthias Schleiden suggested that all plant material is composed of cells. Jan Purkyne observed that animal tissue is composed of cells and the structure is similar to plant tissue. 1852 Evidence for the origin of new cells: Robert Remak observed cell division in animal cells. His findings were not expected at the time. 1860 Spontaneous generation disproved: Louis Pasteur demonstrated that's bacteria will only grow in sterile nutrient broth after it has been exposed to air. [Show More]
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