Biology Lecture 1 Study Guide.pdf - BIOL1302 • Chapter 22 The History of Life on Earth A Diversity of Life on Earth a What are the three domains of

Biology Lecture 1 Study Guide.pdf - BIOL1302 • Chapter 22...

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BIOL1302 Chapter 22: The History of Life on Earth A. Diversity of Life on Earth a. What are the three domains of life? Bacteria Archaea Eukaryotes b. What is a domain? Domain is the highest order of life c. Bacteria and Archaea i. What do these two domains have in common? No nucleus and membrane bound organelles (prokaryotic) d. Eukaryotes ii. What main feature distinguishes eukaryotes from prokaryotes? Eukaryotes have a nucleus with membrane bound organelles e. How did this diversity arise? iii. How many species of organisms are estimated to exist? 8.74 million species on earth iv. What percent of species that have ever lived have gone extinct? 99% of species that ever lived have gone extinct v. How long ago are living organisms estimated to have arisen? 3.8 Billion Years ago vi. What is our best model of how this diversity arose from simple prokaryotic organisms? Evolution fueled by mutations and driven by natural selection, genetic
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