chapter 1-2 - Bio 118 1/25/10 Chapter 1: Biology and the...

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Bio 118 1/25/10 Chapter 1: Biology and the tree of life - Two great ideas that revolutionized science The cell theory The theory of evolution by natural selection - Theory An explanation for a very general class of phenomenon or observations Theories are based on a body of evidence First describes pattern of natural world Second identifies a mechanism or process that is responsible - Hypothesis A proposed explanation that can be tested Scientists then design experiments to test these hypothesis Educated guess Theory: all living organisms are made of cells - The cell theory In the late 1660s Robert Hooke First to look at cells Aton Van Leeuwenhoek First to view single celled “animalcules” in pond water Are all organisms made of cells By the 1800s observed enough specimens YES - Cell A highly organized compartment bound a thin plasma membrane and contains concentrated chemicals in a water solution - First part of the cell theory - Where do cells come from? Spontaneous generation Bacteria in spoiled food just appeared Cells come from preexisting cells Suggested by Rudolph Virchow Each of these were a hypothesis - Proof or all-cells-from-cells hypothesis Louis Pateur Devised an elegant experiment to test both hypotheses See figure 1.2 in chapt 1 - The theory of evolution by natural selection In 1858 Darwin and Wallace proposed that
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chapter 1-2 - Bio 118 1/25/10 Chapter 1: Biology and the...

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