C8e_25_Test_Bank

Biology with MasteringBiologyâ„¢ (8th Edition)

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1 Biology, 8e (Campbell) Chapter 25 The History of Life on Earth Multiple-Choice Questions 1) Which gas was least abundant in Earth's early atmosphere, prior to 2 billion years ago? A) O 2 B) CO 2 C) CH 4 D) H 2 O E) NH 3 Answer: A Topic: Concept 25.1 Skill: Knowledge/Comprehension 2) In their laboratory simulations of the early Earth, Miller and Urey observed the abiotic synthesis of A) amino acids. B) complex organic polymers. C) DNA. D) liposomes. E) genetic systems. Answer: A Topic: Concept 25.1 Skill: Knowledge/Comprehension 3) Which of the factors below weaken the hypothesis of abiotic synthesis of organic monomers in early Earth's atmosphere? 1. the relatively short time between intense meteor bombardment and appearance of the first life forms 2. the lack of experimental evidence that organic monomers can form by abiotic synthesis 3. uncertainty about which gases comprised early Earth's atmosphere A) 1 B) 2 C) 3 D) 1 and 3 E) 2 and 3 Answer: D Topic: Concept 25.1 Skill: Knowledge/Comprehension
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2 4) Which of the following has not yet been synthesized in laboratory experiments studying the origin of life? A) liposomes B) liposomes with selectively permeable membranes C) oligopeptides and other oligomers D) protobionts that use DNA to program protein synthesis E) amino acids Answer: D Topic: Concept 25.1 Skill: Knowledge/Comprehension 5) In what way were conditions on the early Earth of more than 3 billion years ago different from those on today's Earth? A) Only early Earth had water vapor in its atmosphere. B) Only early Earth was intensely bombarded by large space debris. C) Only early Earth had an oxidizing atmosphere. D) Less ultraviolet radiation penetrated Earth's early atmosphere. E) Earth's early atmosphere had significant quantities of ozone. Answer: B Topic: Concept 25.1 Skill: Knowledge/Comprehension 6) What is true of the amino acids that might have been delivered to Earth within carbonaceous chondrites? A) They had the same proportion of L and D isomers as Earth does today. B) The proportion of the amino acids was similar to those produced in the Miller-Urey experiment. C) There were fewer kinds of amino acids on the chondrites than are found in living organisms today. D) They were delivered in the form of polypeptides. Answer: B Topic: Concept 25.1 Skill: Knowledge/Comprehension 7) Which of the following is the correct sequence of these events in the origin of life? I. formation of protobionts II. synthesis of organic monomers III. synthesis of organic polymers IV. formation of DNA-based genetic systems A) I, II, III, IV B) I, III, II, IV C) II, III, I, IV D) IV, III, I, II E) III, II, I, IV
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3 Answer: C Topic: Concept 25.1 Skill: Knowledge/Comprehension 8) Which is a defining characteristic that all protobionts had in common?
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C8e_25_Test_Bank - Biology, 8e (Campbell) Chapter 25 The...

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