Chapter 26 - CR

Chapter 26 - CR - Chapter 26: The Tree of Life An...

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1 of 14 of 14 Chapter 26: Chapter 26: The Tree of Life The Tree of Life An Introduction to Biological An Introduction to Biological Diversity Diversity
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2 of 14 of 14 Life is a continuum Life is a continuum Extending from the earliest organisms to the great variety of species that exist today Geological events that alter environments change the course of biological evolution Conversely, life changes the planet that it inhabits Geologic history and biological history have been episodic, marked by what were, in essence, revolutions that opened many new ways of life Often referred to as “explosions” of speciation events
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3 of 14 of 14 Synthesis of Organic Compounds on Synthesis of Organic Compounds on Early Earth Early Earth Earth formed about 4.6 billion years ago along with the rest of the solar system Earth’s early atmosphere contained water vapor and “reducing” chemicals such as methane (CH 4 ), ammonia (NH 3 ), and sulfur- containing compounds Deep-sea vents and underwater volcanoes were likely candidates for having this mix of chemicals Miller-Urey experiment supported this scenario Carbon compounds have been found in some of the meteorites that have landed on Earth
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4 of 14 of 14 Abiotic Synthesis Abiotic Synthesis of Polymers of Polymers Small organic molecules polymerize when they are concentrated on hot sand, clay, or rock Protobionts are aggregates of abiotically produced molecules surrounded by a membrane structure Liposomes can form when lipids or other organic molecules are added to water 20 μ m (a) Simple reproduction (b) Simple metabolism Glucose-phosphate Glucose-phosphate Phosphorylase Starch Amylase Maltose Maltose Phosphate Figure 26.4a, b
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5 of 14 of 14 The “RNA World” and the Dawn of The “RNA World” and the Dawn of Natural Selection
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This note was uploaded on 04/07/2008 for the course BIO 103 taught by Professor Mannino during the Fall '08 term at Long Island U..

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Chapter 26 - CR - Chapter 26: The Tree of Life An...

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