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11 Cards in this Set
- Front
- Back
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3 parts of cell theory
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1. All living things are made of cells.
2. All cells derive from pre-existing cells. 3. Cells are basic functional units of life. |
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Robert Hooke
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1665 observed cork cells under compound light microscope.
Coined the word 'cell' |
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Anton van Leewenhoek (Dutch)
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1st man to see blood cells,
1st to describe unicellular org.: protozoa, algae, yeasts & bacteria |
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Theory of spontaneous generation (Early Greeks until 17th century)
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Living matter arose from non-living matter or other species e.g. worms from soil/ circle of mushrooms from tree base
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2 main experiments which disproved cell theory
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1. Redi's Experiment 1668
2. Pasteru's Experiment 1860 |
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Redi's Experiment 1668
(worms & maggots not from meat but live parents) |
Meat in 2 flasks. 1 exposed to flies, other covered in netting. Maggots only in open flask.
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Pasteur's Experiment 1860
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nutrient broths into flasks with curve neck shape. broths 1st boiled. 1 neck broken. microbial growth in flask with contact to air. conclude: new life carried by dust particles in air.
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biogenesis
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idea that all life originates from other life (replaces theory of spontaneous generation)
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Introduction of electron microscopes
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higher magnification, higher resolution, high cost, use of magnets to focus electrons, dead specimens only (artefacts appearance from killing process?)
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Living things (MR GREEN)
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Move & made of cells
Respire Grow, make more cells Reproduce Excrete Excitability (react to surroundings) Nutrition (require food & water) |
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Virus a living thing?
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No. Not made of cells. Can only reproduce if overtakes a cell.
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