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15 Cards in this Set
- Front
- Back
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microorganism |
an organism that can be seen in detail only through a microscope |
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3 reasons microbial cells are ideal for understanding basic life processes |
1) easily cultured 2) able to attain high cell numbers 3) can be grown at relatively low cost |
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prokaryotes |
Bacteria & Archaea --lack organelles --less complex than eukaryotes but show greater diversity |
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eukaryotes |
--can be single-celled or multicellular --approx. 10 times the size of prokaryotes --have organelles |
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viruses |
microscopic, replicating biological structure; NOT cellular |
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characteristics of all living systems |
-metabolism -reproduction/growth -communication -evolution |
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characteristics of some living systems |
-differentiation -movement -genetic exchange |
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microbial populations |
groups of organisms derived from a single parents cell |
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Antoni van Leeuwenhoek |
-first person to view bacteria -developed first high magnification lenses (simple microscope) |
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Louis Pasteur |
-swan neck flask disproved spontaneous generation -developed vaccines for rabies, anthrax, and fowl cholera -worked with optical isomers |
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Robert Koch |
-worked with anthrax -Germ Theory of Disease -Koch's Postulate - only way to link cause and effect in an infectious disease |
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Koch Postulate #1 |
the suspected pathogenic microorganism should be present in all cases of the disease and absent from the same tissue/fluids of healthy animals |
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Koch Postulate #2 |
The suspectedpathogenic microorganism should be grown in pure culture. -Pure culture = isolatedand grown away from other microorganisms -Colonies harborpopulation of identical cells |
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Koch Postulate #3 |
cells from a pure culture of the suspected pathogenic microorganism should cause disease in a healthy animal |
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Koch Postulate #4 |
the microorganism should be re-isolated and shown to be the same as the original |
