Chapter_26 - Biology 7e(Campbell Chapter 26 The Tree of...

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Biology, 7e (Campbell) Chapter 26: The Tree of Life: An Introduction to Biological Diversity 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 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 3) 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) nucleoli. 4) 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 5) 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 6) 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.
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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 A) I, II, III B) I, III, II C) II, III, I D) III, I, II E) III, II, I 8) Although absolute distinctions between the "most evolved" protobiont and the first living cell are unclear, biologists generally agree that one major difference is that protobionts could not A) possess a selectively permeable membrane boundary. B) perform osmosis.
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Chapter_26 - Biology 7e(Campbell Chapter 26 The Tree of...

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