Final Practice EXAM

Final Practice EXAM - General Biology 102 Name (Print) _...

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General Biology 102 Name (Print) ______________________________ Lecture Exam III (Morrison) Spring 2005 Signature _________________________________ VERSION A Disc. Leader _____________________ Sec ______ There are 50 questions worth 2 points each. Mark all answers on the scantron. 1. The light from distant galaxies “red shifted,” indicating that the Universe is A. contracting. B. stable. C. expanding. D. oscillating. 2. Before Hubble’s discoveries, Albert Einstein thought the entire universe consisted of A. our sun and its planets. B. our Milky Way galaxy. C. a dome of stars. D. dozens of galaxies. 3. Banded iron formations suggest that 2 billion years ago most of the earth’s living cells were probably poisoned by the release of A. carbon monoxide.
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B. cyanide. C. iridium. D. oxygen. 4. Scientists hypothesize that the first living cell arose by a sequence of spontaneous steps. The LAST step in the sequence was the formation of A. amino acids B. short lengths of DNA C. membrane-like microspheres. D. short lengths of RNA 5. Radio-isotope dating is based on the assumption that, as time goes by, A. the amount of radioisotope in the rock remains the same. B. the temperature and pressure of the rock remains the same. C. the time required for half the radioisotope present in the rock to decay remains the same. D. the ratio of the radioisotope to its stable decay product remains the same. 6. The radioactive isotope “R” decays into the stable form “S”. The half-life of “R” is 50 million years. Chemical analysis reveals that a rock contains 25 units of “R” and 75 units of “S”. How old is the rock? A. 25 million years B. 50 million years C. 100 million years D. 200 million years
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7. According to the “crazy scientist” in the video, the fact that today’s most primitive bacteria are “heat loving” supports the idea that the first living cells originated A. in intertidal pools evaporated by the sun B. on rocks heated by volcanic lava C. on sun-baked mud flats D. on deep sea hot water vents 8. The many similarities between mitochondria and free-living bacteria provide good supporting evidence for A. the endosymbiotic hypothesis B. the Cambrian explosion hypothesis C. the adaptive radiation hypothesis D. the geochemical hypothesis 9. Living organisms could not move out of the water and onto land until after A. the formation of banded iron deposits. B. the formation of the ozone layer. C. the rise of photosynthetic bacteria.
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Final Practice EXAM - General Biology 102 Name (Print) _...

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