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Questions and Answers
Who discovered cells in cork and living plant tissue?
What is the principle that was elucidated by Theodor Schwann and Matthias Jakob Schleiden?
Who built the first transmission electron microscope (TEM)?
What is the theory proposed by Lynn Margulis?
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Who made the first announcement on the double-helix structure of DNA?
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What is the principle stated by Rudolph Virchow?
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What was the significance of Antonie van Leeuwenhoek's work?
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What was the contribution of Robert Hooke to the field of cell biology?
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Who challenged the idea of spontaneous generation?
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What did Ernst Ruska's transmission electron microscope reveal?
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When did Watson and Crick announce their discovery of the double-helix structure of DNA?
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What is the significance of the year 1839 in the history of cell biology?
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What did Rudolph Virchow state in 1855?
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What was the main topic of Lynn Margulis' book published in 1981?
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Study Notes
Early Microscopy and Cell Theory
- Antonie van Leeuwenhoek (1632-1723) taught himself to grind lenses, built a microscope, and drew protozoa like Vorticella from rainwater and bacteria from his own mouth.
- Robert Hooke discovered cells in cork and living plant tissue using an early microscope in 1665.
Founding of Cell Theory
- Theodor Schwann and Matthias Jakob Schleiden elucidated the principle that plants and animals are made of cells, concluding that cells are a common unit of structure and development in 1839.
Refutation of Spontaneous Generation
- Louis Pasteur (1822-1895) contradicted the belief in spontaneous generation, although Francesco Redi had performed an experiment in 1668 suggesting the same conclusion.
Cell Division and Development
- Rudolph Virchow stated that cells always emerge from cell divisions (omnis cellula ex cellula) in 1855.
Advancements in Microscopy
- Ernst Ruska built the first transmission electron microscope (TEM) at the University of Berlin in 1931, revealing previously-unresolvable organelles by 1935.
DNA Structure
- Watson and Crick announced the double-helix structure for DNA on February 28, 1953.
Endosymbiotic Theory
- Lynn Margulis published Symbiosis in Cell Evolution, detailing the endosymbiotic theory, in 1981.
Early Microscopy and Cell Theory
- Antonie van Leeuwenhoek (1632-1723) taught himself to grind lenses, built a microscope, and drew protozoa like Vorticella from rainwater and bacteria from his own mouth.
- Robert Hooke discovered cells in cork and living plant tissue using an early microscope in 1665.
Founding of Cell Theory
- Theodor Schwann and Matthias Jakob Schleiden elucidated the principle that plants and animals are made of cells, concluding that cells are a common unit of structure and development in 1839.
Refutation of Spontaneous Generation
- Louis Pasteur (1822-1895) contradicted the belief in spontaneous generation, although Francesco Redi had performed an experiment in 1668 suggesting the same conclusion.
Cell Division and Development
- Rudolph Virchow stated that cells always emerge from cell divisions (omnis cellula ex cellula) in 1855.
Advancements in Microscopy
- Ernst Ruska built the first transmission electron microscope (TEM) at the University of Berlin in 1931, revealing previously-unresolvable organelles by 1935.
DNA Structure
- Watson and Crick announced the double-helix structure for DNA on February 28, 1953.
Endosymbiotic Theory
- Lynn Margulis published Symbiosis in Cell Evolution, detailing the endosymbiotic theory, in 1981.
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Description
Learn about the pioneering work of scientists like Antonie van Leeuwenhoek, Robert Hooke, Theodor Schwann, and Matthias Jakob Schleiden in the discovery of cells and development of cell theory.
