ch26q_feb08Word (1)

ch26q_feb08Word (1) - BSC1011, Ch. 26, (rev, Feb 6, 2008)...

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BSC1011, Ch. 26, (rev, Feb 6, 2008) 1) The first genetic material was most likely a(n) 1) _______ A) protein enzyme. B) DNA oligonucleotide. C) DNA polymer. D) RNA polymer. E) protein. 2) Which gas was probably least abundant in Earth's early atmosphere? 2) _______ A) ) ) O B) ) ) C) CO D) ) ) E) ) ) 3) In their laboratory simulations of the early Earth, Miller and Urey observed the abiotic synthesis of 3) _______ A) amino acids., hydrocarbons B) DNA. C) complex organic polymers. D) nucleoli. E) liposomes. 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 4) _______ A) had a layer of ozone that shielded the first fragile cells. B) had more oxygen than the modern atmosphere, and thus it successfully sustained the first living organisms. C) removed electrons that impeded the formation of protobionts. D) had less free energy than the modern atmosphere, and thus newly formed organisms were less likely to be destroyed. E) may have been a reducing one that facilitated the formation of complex substances from simple molecules. 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 5) _______ A) II, III, I B) III, I, II C) III, II, I D) I, II, III E) I, III, II 6) Which of the following statements about the origin of genetic material is most probably correct? The first genes were 6) _______ A) protobionts produced by dehydration syntheses of nucleic acids. B) DNA produced by reverse transcriptase from abiotically produced RNA. C) self-replicating, catalytic RNA molecules. D) RNA produced by autocatalytic, proteinaceous enzymes called ribozymes. E) DNA molecules whose information was transcribed to RNA and later translated in polypeptides.
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This note was uploaded on 05/06/2010 for the course BIOLOGY 02541 taught by Professor Jcobs during the Spring '10 term at Wilson Tech.

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ch26q_feb08Word (1) - BSC1011, Ch. 26, (rev, Feb 6, 2008)...

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