Practice Questions - Practice Questions: Lecture V. Here...

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Practice Questions: Lecture V. Here are some practice questions on the material covered in Lectures V. Each multiple choice question has a single correct answer . I suggest you attempt to answer all of the questions before checking the answers. 1. Whereas the first organisms were most likely ________________ , the oldest known microfossils were ________________ similar in appearance to contemporary ______________. 2. The oldest microfossils are believed to have been a. aerobic heterotrophs b. anaerobic hetetrotrophs c. anoxic autotrophs d. methanogenic archaebacteria e. oxygenic autotrophs 3. Stromatolites a. Have existed since the Precambrian b. Formed reef-like structures with photosynthetic bacteria in the upper layers c. Contributed to the oxygenation of earth's atmosphere d. Are vulnerable to invertebrate grazers such as snails and worms e. All of the above 4. Complete the following sentences: 1. Fermentation 1. 2 ATP molecules 2. Aerobic metabolism 2. 36 ATP molecules 3. The energy yield of fermentive metabolism (per molecule of glucose "crunched") is 3. entails the production of pyruvate by glycolysis and the conversion of pyruvate to lactic acid or ethanol.
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4. The energy yield of aerobic metabolism (per molecule of glucose "crunched") is 4. the hydrogen donor is water 5. In oxygenic photosynthesis, 5. combines glycolysis with the citric acid (Krebs) cycle and the respiratory (electron transport) chain. 5. 6. Oxygenic photosysntheis may have arisen as early as as 3750 Mya. This conjecture is supported by the observation of which of the following kinds of rocks or minerals that date from this time? a. Banded iron formations b. Pyritic conglomerates c. Redbeds d. Sedementary rocks called shales e. Shocked quartz 7. Which of the following events is not postulated by the serial endosymbiosis theory of eukaryotic origins? a. at least three symbiogenic events b. fusion of motile eukaryotes and cyanobacteria as the origin of higher plants. c. origin of organelles by "pinching off" from the nuclear membrane d. the first eukaryotes were motile, but lacked mitochondria e. none of the above are postulated by the theory 8. The theory that eukaryotes arose by symbiogenesis was championed by a. A. I. Oparin. b. C. R. Woese. c. J. B. S. Haldane. d. Lynn Margulis. e. Sidney Fox. 9. The symbiogenic origin of eukaryotes is supported by the following: a. Existence of plastid and mitochondrial DNA/RNA b. Different patterns of antibiotic sensitivity among mitochondria and bacteria
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c. Fossil eukaryotes lacking mitochondria d. All of the above e. None of the above 10.Which of the following groups have bodies composed of two cell layers? a. Sponges.
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This note was uploaded on 04/03/2008 for the course ECOL 182r taught by Professor Schaffer during the Spring '08 term at University of Arizona- Tucson.

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Practice Questions - Practice Questions: Lecture V. Here...

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