BISC120 Heidelberg Midterm 2 answer key - Copy

BISC120 Heidelberg Midterm 2 answer key - Copy - Your name:...

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Your name: __Answer Key____ A. Multiple Choice (1 point each). Select the most appropriate answer and write in CAPITAL LETTERS ONLY in the accompanying box. 1) In Miller and Urey laboratory simulation of early earth, the abiotic synthesis of _______ was observed. A. amino acids B. complex organic polymers C. DNA D. liposomes E. genetic systems 2) The “Cambrian Explosion” referes to the changes in the planet when: A. ~ 2.7 billion years ago; photosynthetic prokaryotes began to release oxygen B. ~2.1 billion years ago; the appearance of the eukaryote C. ~535 million years ago; the appearance of large predators, teeth and claws, and body armor D. ~ 65 million years ago; impact at the Chicxulub crater site and the extinction of most dinosaurs E. ~5 milion years ago; origin of the genus Homo 3) Why are viruses referred to as obligate parasites? A. They can incorporate nucleic acids from other viruses B. Viral DNA always inserts itself into host DNA C. They must use enzymes encoded by the virus itself D. They invariably kill any cell they infect E. They cannot reproduce outside of a host cell 4) What is the name given to viruses that are single-stranded RNA that acts as a template for DNA synthesis? A. lytic phages B. proviruses C. retroviruses D. viroids E. bacteriophages 1
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Your name: __Answer Key____ 5) Which of the following obtain energy by oxidizing inorganic substances and use some of this energy to fix CO 2 ? A. photoautotrophs B. photoheterotrophs C. chemoautotrophs D. chemoheterotrophs E. parasitic chemoheterotrophs 6) Which of these is the most common compound in the cell walls of Gram + bacteria? A. cellulose B. lipopolysaccharide C. lignin D. peptidoglycan E. protein 7) Many physicians administer antibiotics to patients at the first sign of any disease symptoms. Why can this practice cause more problems for these patients, and for others not yet infected? A. Antibiotics may interfere with the ability to identify the bacteria present B. Antibiotics may interfere with the ability to identify the viruses present C. The antibiotic administered may kill viruses that had been keeping the bacteria in check D. Particular patients may be allergic to the antibiotic E. Overuse of antibiotics can select for antibiotic-resistant strains of bacteria 8) Using RNA as a template for protein synthesis instead of translating proteins directly
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This note was uploaded on 09/09/2010 for the course BISC 13141 at USC.

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BISC120 Heidelberg Midterm 2 answer key - Copy - Your name:...

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