Lecture 20100907

Lecture 20100907 - Labs start this week! You need to attend...

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1 • Labs start this week! • You need to attend lab to secure your registration • Where is my lab? – go on to myCourses -> my tools -> my grades, under lab room 2 Clicker Exercise • Get out your clickers • Confirm the channel: –Press Go – 41 – Go or CH – 41 - CH • Answer the series of questions. • After each, be sure the green light flashes when you respond to a clicker question G O
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3 Pre-lecture vocabulary It is expected that you understand the following basic terms and concepts prior to this lecture. From section 1.2 & ch. 25 •p r o k a r y o t e • eukaryote • unicellular • multicellular • metabolism • photosynthesis • aerobic • anaerobic From section 4.2-4.3 chemical evolution spontaneous generation monomer o l y m e r condensation reaction (polymerization) amino acid nucleotide DNA, RNA (nucleic acid) catalyst 4 BIOL 111 – Organismal Biology Lecture 2 Origin and evolution of life 7 September 2010
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5 Origin and evolution of life lecture outline 1. Origin of life 2. History of life 3. Modern life 6 Origin and evolution of life
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7 Origin of life on Earth 1. Extraterrestrial source? 2. Chemical evolution on Earth? 8 Chemical evolution – experiments of Miller & Urey (1950s) 1. Mimic Earth’s early atmosphere •C H 4 , N 2 , NH 3 , H 2 , H 2 O, CO 2 2. Zap with electricity 3. Condense and analyze for simple organic compounds Found many of building blocks of life a) all 5 bases in DNA and RNA b) 17 of 20 amino acids used in protein synthesis c) 3- and 6-carbon sugars
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9 A recipe for life 1. Take early (pre-O 2 ) atmosphere & zap with lightning form monomers (amino acids, nucleotides, sugars) 2. Place monomers in several locations favorable to condensation reactions (clay shores, hydrothermal vents, hot pools) polymers (proteins, carbohydrates, RNA/DNA, lipids) 10 A recipe for life 3. RNA before DNA Simpler Acts as a catalyst 4. Lipids naturally form bilayer spheres encapsulate RNA providing more stable environment 5.
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This note was uploaded on 09/29/2010 for the course SCIENCE 110 taught by Professor Irene during the Spring '10 term at McGill.

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Lecture 20100907 - Labs start this week! You need to attend...

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