Name Period Chapter 25: The History of Life on Earth Overview 1. In the last chapter, you were asked about To begin this chapter, give some macroevolution. examples of Include at least one novel example not in your text. macroevolution. Concept 25.1 Conditions on early Earth made the origin of life possible 2. How old is the planet? How old is the earliest evidence of life on Earth? 3. Consider the early planet, probably thick with water vapor and stinky with methane, ammonia, and hydrogen sulfide. What gas was missing from this early mix? Why? 4. A. I. Oparin and J. B. S. Haldane hypothesized that the early atmosphere was a reducing What did they suggest was the source of energy for early organic synthesis? environment. 5. In 1953 at the University of Chicago, and tested the Stanly Miller Harold Urey Oparin- with the apparatus shown in Chapter 4, Figure 4.2. Explain the elements Haldane hypothesis of this experiment. 6. What was collected in the sample for chemical analysis? What was concluded from the results of this experiment? 7. What are What properties of life do they demonstrate? protocells? 8. What did propose was the first genetic material, DNA or RNA? Thomas Cech 9. What are ribozymes?
Name Period Chapter 25: The History of Life on Earth Overview 1. In the last chapter, you were asked about macroevolution. To begin this chapter, give some examples of macroevolution. Include at least one novel example not in your text. Concept 25.1 Conditions on early Earth made the origin of life possible 2. How old is the planet? How old is the earliest evidence of life on Earth? 3. Consider the early planet, probably thick with water vapor and stinky with methane, ammonia, and hydrogen sulfide. What gas was missing from this early mix? Why? 4. A. I. Oparin and J. B. S. Haldane hypothesized that the early atmosphere was a reducing environment. What did they suggest was the source of energy for early organic synthesis? 5. In 1953 at the University of Chicago, Stanly Miller and Harold Urey tested the Oparin- Haldane hypothesis with the apparatus shown in Chapter 4, Figure 4.2. Explain the elements of this experiment. 6. What was collected in the sample for chemical analysis? What was concluded from the results of this experiment? 7. What are protocells? What properties of life do they demonstrate? 8. What did Thomas Cech propose was the first genetic material, DNA or RNA? 9. What are ribozymes?