Take home test (2)

Take home test (2) - Take home test Multiple Choice...

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Take home test Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. The first genetic material was most likely a(n) a. DNA polymer. b. DNA oligonucleotide. c. RNA polymer. d. protein. e. protein enzyme. ____ 2. Which putative early Earth condition did Miller and Urey's experimental apparatus not attempt to simulate directly? a. presence of water vapor b. intense lightning storms c. warm seas d. intense UV bombardment e. reducing atmosphere ____ 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. What condition would have made the primitive atmosphere of Earth more conducive to the origin of life than the present one? The primitive atmosphere a. had a layer of ozone that shielded the first fragile cells. b. removed electrons that impeded the formation of protobionts. c. may have been a reducing one that facilitated the formation of complex substances from simple molecules. d. had more oxygen than the modern atmosphere, and thus it successfully sustained the first living organisms. e. had less free energy than the modern atmosphere, and thus newly formed organisms were less likely to be destroyed. ____ 5. 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
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a. I, II, III b. I, III, II c. II, III, I d. III, I, II e. III, II, I ____ 6. Which of the following statements about the origin of genetic material is most probably correct? The first genes were a. DNA produced by reverse transcriptase from abiotically produced RNA. b. DNA molecules whose information was transcribed to RNA and later translated in polypeptides. c. self-replicating, catalytic RNA molecules. d. RNA produced by autocatalytic, proteinaceous enzymes called ribozymes. e. protobionts produced by dehydration syntheses of nucleic acids. ____ 7. The synthesis of new DNA requires the prior existence of oligonucleotides to serve as primers. On Earth, these primers are small RNA molecules. This latter observation is evidence in support of the hypothesized existence of a. a snowball Earth. b. an RNA world. c. the abiotic synthesis of organic monomers. d. the delivery of organic matter to Earth by meteors and comets. e. the endosymbiotic origin of mitochondria and chloroplasts. ____ 8.
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Take home test (2) - Take home test Multiple Choice...

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