Questions and Answers
Which scientist is credited with the initial observation that all plants are composed of cells?
What key observation did Theodore Schwann make regarding animal cells?
What is the primary difference between the cell theory as proposed by Schleiden and Schwann and the modified theory by Virchow?
Which of the following is NOT a fundamental principle of the modern cell theory?
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Which of the following correctly describes the contributions of Matthias Schleiden and Theodore Schwann to the development of the cell theory?
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Why was the original cell theory considered incomplete before Rudolf Virchow's contribution?
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What is the central idea conveyed by the phrase "Omnis cellula-e cellula"?
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Study Notes
Cell Theory
- In 1838, Matthias Schleiden observed that plants are composed of different kinds of cells that form plant tissues.
- In 1839, Theodore Schwann studied animal cells and discovered the plasma membrane, also concluding that plant cells have a unique cell wall.
- Schwann proposed that the bodies of animals and plants are composed of cells and products of cells.
- Schleiden and Schwann together formulated the cell theory.
Contributions of Rudolf Virchow
- In 1855, Rudolf Virchow explained that cells divide and new cells are formed from pre-existing cells, known as "Omnis cellula-e cellula".
- Virchow modified the hypothesis of Schleiden and Schwann to give the cell theory its final shape.
Modern Cell Theory
- All living organisms are composed of cells and products of cells.
- All cells arise from pre-existing cells.
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Description
Discover the contributions of Matthias Schleiden, Theodore Schwann, and Rudolf Virchow to the cell theory, including their observations and proposals about plant and animal cells.