1. Click to edit Master title style Click to edit Master subtitle style CLICKER QUESTIONS For CAMPBELL BIOLOGY, NINTH EDITION Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson © 2011 Pearson Education, Inc. The History of Life on Earth Chapter 25 Questions prepared by William Wischusen Louisiana State University Michael Dini Texas Tech University

2. © 2011 Pearson Education, Inc. Why do some scientists believe that RNA, rather than DNA, was the first genetic material? a)RNA has both information storage and catalytic properties. b)RNA contains uracil in place of thymine. c)RNA could have evolved into DNA. d)RNA can replicate more accurately than DNA. e)All the protocells on early Earth contained RNA.

3. © 2011 Pearson Education, Inc. Radiometric dating ____________. a)can be used to directly date fossils in sedimentary rock b)relies on the fact that the daughter isotope decays to the parent isotope at a constant rate c)allows us to indirectly date fossils up to billions of years old based on minerals in surrounding volcanic strata d)works only on rocks younger than 75,000 years e)allows us to determine an absolute, errorless date

4. © 2011 Pearson Education, Inc. a)A, B, C b)B, C, A c)C, A, B d)A, C, B You discover three fossil organisms and want to determine their dates. You measure the percentage of carbon-14 (half-life 5,730 years) remaining in the fossils. Which of the following correctly places them in order from oldest to youngest? Fossil% 14 C A38.7 B77.0 C52.1

5. © 2011 Pearson Education, Inc. You discover a series of fossil organisms and want to determine their dates. You decide to use carbon-14 dating (half-life 5,730 years). Based on the table below, about how old are fossils A and B? a)57,300 years b)5,730 years c)2,865 years d)1,432 years e)other Sample 14 C to 12 C ratio Normal1 to 1 million Fossil A0.74 to 1 million Fossil B0.76 to 1 million

6. © 2011 Pearson Education, Inc. If the mitochondria and chloroplasts in eukaryotic cells resulted from endosymbiosis, what feature(s) might we expect these organelles to contain? a)a plasma membrane, DNA, and ribosomes b)a plasma membrane, nucleus, and ribosomes c)nucleus, DNA, and ribosomes d)a plasma membrane, nucleus, and cilia e)nucleus, ribosomes, and cilia