1. © 2010 Pearson Education, Inc. Clicker Questions for use with Classroom Response Systems Campbell Essential Biology, Fourth Edition – Simon, Reece, and Dickey Campbell Essential Biology with Physiology, Third Edition – Simon, Reece, and Dickey Questions prepared by Brad Williamson, updated by Mike Tveten The Evolution of Microbial Life Chapter 15

2. © 2010 Pearson Education, Inc. Concept Check The letters on the timeline at the right point to major milestones in life’s history. Which letter points to the approximate date of the first eukaryotes? a.A b.B c.C d.D

3. © 2010 Pearson Education, Inc. Concept Check The letters on the timeline at the right point to major milestones in life’s history. Which letter points to the earliest known prokaryotic fossils? a.A b.B c.C d.D

4. © 2010 Pearson Education, Inc. Concept Check Prokaryotes’ modes of nutrition are more diverse than eukaryotes’—they have more ways to make a living. Nutrition provides two main resources: energy and carbon for building compounds. What source of energy do photoautotrophs and photoheterotrophs exploit as their primary source of energy? a.inorganic chemicals b.sunlight c.carbon compounds d.carbon dioxide

5. © 2010 Pearson Education, Inc. Concept Check Which of the following describes one of the differences between heterotrophs and autotrophs? a.Autotrophs use organic compounds as a carbon source. b.Autotrophs use inorganic compounds as a carbon source. c.Autotrophs use sunlight as a carbon source. d.Autotrophs use carbon dioxide as a carbon source.