Download - Cells
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Cells
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Is fire a living thing?
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Robert Hooke
• Observed cork under a microscope• Called the little boxes cells
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Anton van Leeuwenhoek
• Examined blood, rain water, teeth scrapings• Found tiny animal-like things• Led to better microscopes
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Other Scientists
• The discoveries of Hooke and van Leeuwenhoek led to better tools and other discoveries about cells.
M. Schleiden T. Schwann R. Virchow(Botanist) (Zoologist) (Pathologist)
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Cell Theory
• All living thing are made of cells• Cells carry out the functions needed to
support life• Cells come from other living cells
Scientific Theory – widely accepted explanation of things in nature. It must be supported by evidence.
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Louis Pasteur
• Noticed milk that soured contained many bacteria
• He invented a process that killed the bacteria and allowed the milk to last longer
• He wondered if bacteria were responsible for the illnesses in people and animals.
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Louis Pasteur
• He noticed by studying air, water and soil that bacteria were everywhere (germs)
• He realized that by understanding germs we could prevent disease• His work led to vaccines
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Spontaneous Generation
• Life could come from nonliving things
• Pasteur showed in a series of experiments that spontaneous generation can not occur
• He supported cell theory
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Redi’s Experiment
• Shows that the presence of maggots was not spontaneous but a result of fly offspring
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Pasteur’s Experiment
• Showed that bacteria was in the air and did not spontaneously generate.