BIOL 1001 Jan27

BIOL 1001 Jan27 - Observation bacteria wouldn’t grow near...

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BIOL 1001 Jan. 27 The Science of Biology All events can be attributed to natural causes Natural laws apply at all places and all times People perceive events in similar ways Scientific Method Observation- something unexpected happens Hypothesis- explanation; if/then prediction Experiment- controlled test; challenge prediction Conclusion- supports or doesn’t support hypothesis if it doesn’t then: Modify hypothesis and start again from hypothesis Scientific Theories General statements about how things operate o Derived through reasoning from detailed facts to general principles o Survived thorough challenges o Never the final “truth” Always provisional Always subject to change o Used to propose hypothesis Alexander Fleming - born 1881 in Scotland, died 1955 In 1920 a culture dish became contaminated with a mold during one of his experiments
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Unformatted text preview: Observation: bacteria wouldn’t grow near mold • Hypotheses: the mold releases a substance that kills off bacteria • Experiment: extracted fluid from mold and it inhibited bacterial growth. That fluid was later isolated and called penicillin (1 st antibiotic). The Noble Prize in Physiology or Medicine 1945: Alex Fleming and two others: “For the discovery of penicillin and its curative effect in various infectious diseases.” CHAPTER 2: Atoms, Molecules, and Life What are Atoms? • Atom: the basic structural unit of matter o –i.e., the smallest pieces of stuff o Protons- +1 o Electrons- -1 o Opposites attract Different elements have different number of protons. Element: 1. Defined by number of protons = atomic number 2. Has specific physical and chemical properties 3. Can’t be broken down by chemical reactions...
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This note was uploaded on 04/07/2011 for the course BIOL 1001 taught by Professor Minor during the Spring '08 term at LSU.

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