ch 26 (1) - Chapter 26 Early Earth and the Origin of Life...

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Chapter 26 Early Earth and the Origin of Life Question Bank MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) What is the strongest evidence that protobionts may have formed spontaneously? A) The discovery of ribozymes, showing that prebiotic RNA molecules may have been autocatalytic. B) The relative ease with which liposomes can be synthesized in laboratories. C) The fossil record found in the stromatolites. D) The abiotic synthesis of polymers. E) The production of organic compounds within a laboratory apparatus simulating conditions on early Earth. 2) Current theories of prebiotic evolution are based on evidence for all of the following except the abiotic A) production of small organic molecules. B) polymerization of amino acids. C) replication of oligopeptides. D) origin of DNA-protein interactions. E) production of liposomes. 3) The first genetic material was most likely a(n) A) DNA polymer. B) DNA oligonucleotide. C) RNA polymer. D) protein. E) protein enzyme. SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Use the following information to answer the questions below. According to the Miller-Urey experimental results, chemical evolution leading up to and including the formation of living matter is believed to have occurred during the early history of Earth. Below are four pairs of events that might have occurred during this period. Judge the relative time of each of these pairs of events according to the key below. A. Event I occurred before Event II. B. Event II occurred before Event I. C. Events I and II occurred simultaneously. 4) Event I: nitrogen oxides and carbon dioxide in the atmosphere Event II: free oxygen in the atmosphere 5) Event I: formation of photosynthetic organisms Event II: formation of heterotrophic organisms 6) Event I: formation of amino acids Event II: formation of enzymes 7) Event I: atmosphere of water, methane, and ammonia Event II: reducing atmosphere MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 8) Approximately how far does the fossil record extend back in time? A) 6,000 years B) 3,500,000 years C) 6,000,000 years D) 3,500,000,000 years E) 5,000,000,000,000 years 9) Which gas was probably least abundant in Earth's early atmosphere? A) O 2 B) CO C) CH 4 D) H 2 O E) NH 3 10) In his laboratory simulation of the early Earth, Miller observed the abiotic synthesis of A)
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amino acids. B) complex organic polymers. C) DNA. D) liposomes. E) nucleoli. 11) Which of the following factors was most important in the origin of life on Earth? A) natural selection acting on molecules and protobionts B) competition for oxygen C) low levels of solar energy D) biotic synthesis of organic molecules E) low-intensity electrical discharges in the upper atmosphere 12) Which of the following has not yet been synthesized in laboratory experiments studying the origin of life? A) lipids
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ch 26 (1) - Chapter 26 Early Earth and the Origin of Life...

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