Questions and Answers
What is the fundamental structural and functional unit of all living organisms?
Who first saw and described a live cell?
What is the unique character of plant cells, according to Schwann?
What is the literal meaning of the term 'Omnis cellula-e cellula'?
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What is the final shape of the cell theory attributed to?
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Who examined a large number of plants and observed that all plants are composed of different kinds of cells?
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What is the correct sequence of scientists who contributed to the development of the cell theory?
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What was the major contribution of Rudolf Virchow to the cell theory?
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What is the importance of the invention of the microscope in the discovery of cells?
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What is the correct definition of the cell theory?
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Study Notes
Characteristics of Unicellular Organisms
- Capable of independent existence
- Perform essential functions of life
Cell as the Fundamental Unit
- Cell is the fundamental structural and functional unit of all living organisms
- Anything less than a complete structure of a cell does not ensure independent living
Discovery of Cell Structure
- Anton Von Leeuwenhoek first saw and described a live cell
- Robert Brown discovered the nucleus
- Invention of the microscope and electron microscope revealed structural details of the cell
Contributions of Schleiden and Schwann
- Matthias Schleiden (1838) observed that all plants are composed of different kinds of cells
- Theodor Schwann (1839) studied animal cells and reported a thin outer layer (plasma membrane)
- Schwann proposed that bodies of animals and plants are composed of cells and products of cells based on his studies on plant tissues
Cell Theory
- Schleiden and Schwann formulated the cell theory
- Rudolf Virchow (1855) explained that cells divide and new cells are formed from pre-existing cells (Omnis cellula-e cellula)
- Modified hypothesis of Schleiden and Schwann to give the cell theory its final shape
- Cell theory as understood today:
- All living organisms are composed of cells and products of cells
- All cells arise from pre-existing cells
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Description
Learn about the basic structure and functions of cells, and how they are the fundamental units of life. Discover how scientists like Anton Von Leeuwenhoek and Robert Brown contributed to our understanding of cells.
