Ch-25-Test-questions

Ch-25-Test-questions - Biology 8e(Campbell Chapter 25 The History of Life on Earth Multiple-Choice Questions 1 Which gas was least abundant in

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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 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. 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 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 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. 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. 1
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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 8) Which is a defining characteristic that all protobionts had in common? A) the ability to synthesize enzymes B) a surrounding membrane or membrane-like structure C) RNA genes D) a nucleus E) the ability to replicate RNA 9) Although absolute distinctions between the "most evolved" protobiont and the first living cell are unclear, biologists generally agree that one major difference is that the typical protobiont could not A) possess a selectively permeable membrane boundary. B) perform osmosis.
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This note was uploaded on 02/25/2011 for the course BIO 1105 taught by Professor Dawkins during the Spring '10 term at McKendree.

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Ch-25-Test-questions - Biology 8e(Campbell Chapter 25 The History of Life on Earth Multiple-Choice Questions 1 Which gas was least abundant in

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