Biology - Cell theory

Biology - Cell theory
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  • All organisms are made of cells. A cell’s structure is closely related to its function. The discovery of cells was aided by the new technology — the microscope. 
  • The invention of the compound microscope by the Dutch eyeglass maker Zacharias Janssen in the late 1500s was an early step toward cell discovery. 
  •  Zacharias Janssen.
  • A compound microscope contains two or more lenses. Total magnification, the product of the magnifying power of each individual lens, is generally much more powerful with a compound microscope than with a single lens.
  • Discovery of Cell
  • In 1665, Robert Hooke observed that cork is made of tiny, hollow compartments. The compartments reminded Hooke of small rooms found in a monastery, so he gave them the same name: cells. 
  • Robert Hooke
  • Around the same time, Anton van Leeuwenhoek was studying new methods for making lenses to examine cloth. As a result of his research, his microscope was much more powerful than Hooke’s microscope.
  • Robert Hooke
  • Anton van Leeuwenhoek
  • In 1674, Leeuwenhoek became one of the first people to describe living cells when he observed numerous single-celled organisms swimming in a drop of pond water. 
  • Anton van Leeuwenhoek
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