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F09.SQ01 Lect 1-4

F09.SQ01 Lect 1-4 - BioMI 2900 4 Sep 2009 Study Questions#1...

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BioMI 2900 4 Sep 2009 Study Questions #1 - Lectures 1-4 Part I. The History of Life 1) Describe the conditions of early Earth 4.2 - 3.8 billion years ago (GYA) as the first life was starting on Earth. What geological and geochemical evidence shows that liquid water, which is essential for life to evolve, was present on Earth during that time period? 2) Describe the Miller/Urey “organic soup” experiment. a) What did the experiment prove about the origin of organic precursor molecules and life on early Earth? b) What are some problems with the “organic soup” theory? c) Describe a possible alternate hypothesis? 3) Most scientists agree that once organic precursors accumulated, they had to somehow polymerize, and then evolve into a cell-like replicative form. a) Describe how the "RNA World" theory and the theory of polymerization on mineral surfaces explain these events. b) What are some problems with these theories? 4) List 4 probable characteristics of protocells in the RNA world.
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