Q_ch25_sp09 - Ch 25 History Life on Earth Quiz(rev 1 Name...

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Ch. 25, History Life on Earth, Quiz (rev. 1/31/09) Name__________________________ 1)
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Which gas was least abunda nt in Earth's early atmosp here, prior to 2 billion years ago?
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1)
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______ _ A)
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O 2
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B)
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CO 2
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C)
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NH 3
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D)
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CH 4
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E) H 2
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Which of the followin g is the correct sequenc e of these events in the origin of life? I. formatio n of protobio nts II. synthesi s of organic monom ers III. synthesi s of organic polymer s IV. formatio n of DNA- based genetic systems
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2) ___ ____ I I , III , I, IV I, II, III, IV
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III, II, I, IV D)
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IV, III, I, II E)
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I, III, II, IV 3)
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The first genes on Earth were probabl y
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3) ___ ____ D N A p r o d u c e d b y r e v e r s e t r a n s cr ip ta s e fr o m a bi ot ic al ly pr o d u c e d R N A. oli g opeptides located within protobionts.
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auto-catalytic RNA molecules. D)
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RNA produced by autocatalytic, proteinaceous enzymes. E)
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DNA molecules whose information was transcribed to RNA and later translated in polypeptides. 4)
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RNA molecul es can both carry genetic informat ion and be catalytic . This support s the proposa l that
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4) ___ ____ R N A w a s t h e f i r st h er e di ta ry in fo r m at io n. R N A is a polymer of amino acids.
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protobionts had an RNA membrane. D)
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RNA could make energy. E)
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free nucleotides would not have been necessary ingredients in the synthesis of new RNA molecules. 5)
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What probabl y account s for the switch to DNA- based genetic systems during the evolutio n of life on Earth?
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5) ___ ____ R N A i s t o o i n v o l v e d w i t h t r a n s l a t io n of pr ot ei n s a n d c a n n ot pr o vi d e m ul ti pl e fu n ct io n s. R e plication of RNA occurs too slowly.
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DNA forms the rod-shaped chromosomes necessary for cell division. D)
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This note was uploaded on 02/07/2011 for the course BIOS 101 taught by Professor Matthews during the Spring '11 term at DeVry Austin.

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Q_ch25_sp09 - Ch 25 History Life on Earth Quiz(rev 1 Name...

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