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Unformatted text preview: 1665- Robert Hooke – crude microscope 30x (303)Examined: structure of cork from oak treeSaw: small, pore-like compartments called cellsAnton van Leeuwenhoek- more powerful microscope- may be up to 3003Examined: pond waterSaw: single-celled organisms called ParameciumExamined: structure of human cells and sperm cells1970s- researcherExamined: leaves and stems of plantsSaw: many individual cellsEarly 1800s- biologists with enough data concluded all organisms consisted of cellsCell- highly organized compartment that is bounded by a thin, flexible structure called a plasma membrane and that contains concentrated chemicals in an aqueous solution1858- Rudolph Virchow- all cells arise from preexisting cellsHypothesis- a proposed explanationPrediction- something that can be measured and that must be correct if a hypothesis is validLouis Pasteur- microorganism could arise spontaneously in a nutrient broth or whether they appear only when a broth is exposed to a source of preexisting cellsSpontaneous generation hypothesis- cells arise spontaneously from nonliving materials...
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This note was uploaded on 10/25/2009 for the course LIFESCI Life scien taught by Professor Lorenz,t.c. during the Fall '09 term at UCLA.
- Fall '09