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Questions and Answers
Who discovered the cells for the first time?
Who observed free-living cells in pond water for the first time?
Who is credited with the discovery of the cell nucleus?
Who proposed the cell theory stating that all plants and animals are made up of cells?
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Who advanced the cell hypothesis by claiming that all cells originate from pre-existing cells?
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What are the three distinct features of every cell?
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What is the term for the process through which the cell membrane allows some substances to pass into and out of the cell?
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What is the main difference between diffusion and osmosis?
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What gives rise to every multicellular organism?
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Which organelle is responsible for the division of labor within a single cell?
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Study Notes
Cell Discovery and Theory
- Antonie van Leeuwenhoek observed free-living cells in pond water for the first time.
- Matthias Jakob Schleiden and Theodor Schwann proposed the cell theory, stating that all plants and animals are made up of cells.
- Rudolf Virchow advanced the cell hypothesis by claiming that all cells originate from pre-existing cells.
Cell Structure and Function
- Every cell has three distinct features: cell membrane, cytoplasm, and genetic material.
- The process of the cell membrane allowing some substances to pass into and out of the cell is called selective permeability.
- Diffusion is the random movement of molecules from an area of higher concentration to an area of lower concentration, whereas osmosis is the movement of water molecules from an area of higher concentration to an area of lower concentration.
Cell Development and Organelles
- Every multicellular organism arises from a single cell, the zygote.
- The organelle responsible for the division of labor within a single cell is the mitochondria.
Cell Nucleus
- Matthias Jakob Schleiden is credited with the discovery of the cell nucleus.
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Description
Learn about the components of living organisms, the discovery of cells, and the importance of cells as the building blocks of life. Explore the history of cell discovery and the significance of the nucleus.
