Bio 201 F08 True lect 8v3r

Bio 201 F08 True lect 8v3r - 1st midterm exam Mon Sep. 29,...

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1st midterm exam • Mon Sep. 29, in class – On material through Wed. 9/24 – 35 multiple choice questions – 3 bonus factoids, can only help, cannot hurt Be on time! – Bring your SBU ID and pencils , that’s all
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Exam 1 review sessions • Thursday Sept. 25, 9:30-11:30am • Friday Sept. 26, 1-3pm. • Life Sciences 038 • Bring your questions.
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An RNA world? Machinery for making polypeptidies ribosomes May have evolved during the “RNA world” leading to the macromolecular components we know today
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Biological evolution begins: the evolution of cells Cell membranes are needed to enclose and protect the molecular components -conserve and concentrate valuable macromolecules and energy sources controllable inside environment for metabolism (e.g. ion concentrations)
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The first cells: membranes Enclosed membranes can form spontaneously by phospholipids in aqueous solution
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http://www.usc.edu/dept/mda/180evolution/IMAGES/ A possible source of some organic compounds…
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http://www.usc.edu/dept/mda/180evolution/IMAGES/ Eukarya Bacteria Earliest fossils Stromatolites - structures formed by cyanobacteria-like organisms
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Evolution of Earth’s ancient ecosystem Marine photosynthetic bacteria dominated the earth for 1-2 billion years Before this time - no oxygen in atmophere Massive production of oxygen for a very long time – Oxygenated the oceans – Oxidized most of the iron on Earth (now mined as iron ore) – Then, increased percentage of oxygen in atmosphere Enabled the evolution of organisms with respiratory metabolism
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Earliest fossils: prokaryotes
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Earliest fossils: eukaryotes
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A whirlwind tour of the Prokaryotic world • Prokaryotes – Most abundant organisms on Earth – Found in more habitats than Eukaryotes
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Bio 201 F08 True lect 8v3r - 1st midterm exam Mon Sep. 29,...

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