10 Questions
Who discovered the nucleus in the cell?
Robert Brown
Which scientists presented the cell theory?
Schleiden and Schwann
Who was responsible for coining the term 'protoplasm' for the fluid substance of the cell?
Purkinje
Which scientist suggested that all cells arise from pre-existing cells?
Virchow
When was it possible to observe and understand the complex structure of the cell and its organelles?
1940
Who discovered the free-living cells in pond water for the first time?
Leeuwenhoek
Which scientist was responsible for the discovery of the nucleus in the cell?
Robert Brown
Who coined the term ‘protoplasm’ for the fluid substance of the cell?
Purkinje
In which year did Schleiden and Schwann present the cell theory that all plants and animals are composed of cells?
1838
Who suggested that all cells arise from pre-existing cells?
Virchow
Study Notes
Discovery of Cells
- Robert Hooke discovered cells in 1665 by observing cork slices under a primitive microscope.
Early Microscopy
- In 1674, Leeuwenhoek discovered free-living cells in pond water using an improved microscope.
Cell Structure
- Robert Brown discovered the nucleus in cells in 1831.
- Purkinje coined the term 'protoplasm' in 1839 to describe the fluid substance within cells.
Cell Theory
- In 1838, Schleiden proposed that all plants are composed of cells.
- In 1839, Schwann extended this idea to propose that all animals are also composed of cells.
- The cell theory states that cells are the basic units of life.
Development of Cell Theory
- Virchow expanded the cell theory in 1855 by suggesting that all cells arise from pre-existing cells.
Advancements in Microscopy
- The invention of the electron microscope in 1940 enabled the observation and understanding of the complex structure of cells and their organelles.
Learn about the important milestones in the discovery of cells, including the observations made by Robert Hooke, Leeuwenhoek, Robert Brown, and Purkinje. Explore the early history of cell biology and key contributions that led to the development of the cell theory.
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