Jan29Lec10 - Transcribed lecture notes What Is The Origin...

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1/29/10 Transcribed lecture notes 1 What Is The Origin Of Life? NOTE: I will use these notes to direct you to key concepts you should know from lecture. FYI- anything you see INSIDE A BOX is supplemental information to help understand lecture information—you will not be tested on material inside a box. You do not need to know the formulas that were presented in lecture today Study Aide: Complete the practice questions that Randy writes for you [pre-lecture & post-lecture questions posted online]. If you have any questions about how to answer them, please ask in class OR attend Randy’s office hours (or schedule appointment with Randy). ( ppt Clicker Question ): The correct answer to the question about Fleming’s research is letter C. This question emphasizes the scientific value of a prepared mind recognizing accidental discoveries. Last lecture covered : Serendipity & chance may provide important opportunities if you have a prepared mind. The nature of scientific discovery. The role of chance in biological research. The Fermi Solution, the power of numbers, and dimensional analysis – analytical approach leads you to answers Curiosity may be a double-edged sword. Today’s lecture will cover : Spontaneous generation The evolution of the Universe Prebiotic chemical evolution The origin of life _________________ (ppt) Where did life originate? Up to the 1,700’s it was not known how women conceived Spontaneous generation believed to be the source of life [evidence of this argued when one looked at insects emerging from mud] (ppt) Poet [ Francesco Redi ] His experiments disproved spontaneous generation hypothesis. What evidence was used by Redi to disprove the spontaneous generation hypothesis? [see ppts for description of experiment]
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1/29/10 Transcribed lecture notes 2 (ppt) 17 th century through 18 th century evidence mounted that was used to demonstrate that life arose from pre-existing life. --- Leeuwenhoek discovered micro- organisms (ppt SERIES) Needham provided what evidence that spontaneous generation WAS the source of life??? See his experiment examining spontaneous generation summarized on the ppt slides and ppt PDF’s (ppt) Spallanzani TESTED Needham’s experiment and demonstrated that microbes MUST be PRESENT in order for life to proliferate. Disproved the spontaneous generation hypothesis Argued life arises from pre-existing life forms (ppt) Needham’s supporters argued that Spallanzani only demonstrated that life needed air to exist [why might they conclude this? See ppts for description of experiment]. (ppt Series) Louis Pasteur [KNOW WHO THIS IS, HIS EXPERIMENT & WHY IT’S IMPORTANT] Allowed free movement of air Inhibited free movement of microbes Sterilization prohibited the movement of microbes—result was no growth of microbes [how does the shape of the flask relate to his experiment?? Know ] – this design is essential to the
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Jan29Lec10 - Transcribed lecture notes What Is The Origin...

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