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CELL THOERY Sun Hwa Dong

CELL THOERY Sun Hwa Dong. CELL. Cell Theory. All living things are composed of cells. Cells are the smallest unit of life. All cells are from pre-existing cells by cell division. History of Cell Theory. Robert Hooke - 1 st discovered the cell

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CELL THOERY Sun Hwa Dong

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  1. CELL THOERYSun Hwa Dong

  2. CELL

  3. Cell Theory • All living things are composed of cells. • Cells are the smallest unit of life. • All cells are from pre-existing cells by cell division.

  4. History of Cell Theory • Robert Hooke- 1st discovered the cell • Antony Van Leeuwenhoek-1st observed a living cell using microscope. • Schleiden & Schwaan- “Plants and animals are made of 'independent, separate beings' called cells.”

  5. Modern Interpretation + Original Cell Theory • The energy flow take place within cells. • Cells contain DNA that is inherited from cell to cell in the progress of cell division. • All cells are basically identical in chemical composition in organisms of similar species. 4. The total activity of independent cells decides the activity of an organism.

  6. Unicellular organisms • Metabolism • Response • Homeostasis • Growth • Reproduction • Nutrition

  7. Multicellular organisms • Specialized for specific function: differentiation • Uses genes in nucleus, but not others: gene is being expressed • Ex: Red blood cell carries oxygen around the body

  8. Bibliography • Study Guide pg 3 • Course Companion pg 4 • www.studystack.com/flashcard-29229 • en.wikipedia.org/wiki/Cell_theory • scienceaid.co.uk/biology/plants/cells.html • lgfl.skoool.co.uk/examcentre.aspx?id=208

  9. Vocabulary • Cell membrane: a thin structure that surrounds both plant and animal cells and its main job is to determine what can enter and exit the cell. • Cytoplasm: jelly-like substance between cell membrane and nucleus. • Mitochondria: “power producer” of a cell. • Metabolism: chemical reactions inside the cell, including cell respiration to release energy • Homeostasis: keeping conditions inside the organism within tolerable limits

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