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bio7_ch26 - Biology 7e(Campbell Chapter 26 The Tree of Life...

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Biology, 7e (Campbell) Chapter 26: The Tree of Life: An Introduction to Biological Diversity Chapter Questions 1) The first genetic material was most likely a(n) A) DNA polymer. B) DNA oligonucleotide. C) RNA polymer. D) protein. E) protein enzyme. Answer: C Topic: Concept 26.1 Skill: Knowledge 2) Which gas was probably least abundant in Earth's early atmosphere? Topic: Concept 26.1 Skill: Knowledge 3) In their laboratory simulations of the early Earth, Miller and Urey observed the abiotic synthesis of Topic: Concept 26.1 Skill: Knowledge 4) Which putative early Earth condition did Miller and Urey's experimental apparatus not attempt to simulate directly? Topic: Concept 26.1 Skill: Comprehension 1
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5) 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 26.1 Skill: Comprehension 6) The early atmosphere of Earth probably retained all of the following molecules in substantial amounts except Topic: Concept 26.1 Skill: Knowledge 7) Which of the following has not yet been synthesized in laboratory experiments studying the origin of life? Topic: Concept 26.1 Skill: Comprehension 8) In what way were conditions on Earth more than 2 billion years ago different from those on Earth today? Topic: Concept 26.1 Skill: Knowledge 2
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