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BIO-2009Octtober (with answers).pdf

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Western University
Biology 1001A
Tom Haffie

October 09 Bio 1222 Page 1 of 11 Circle the best single letter choice for each of the following questions before transferring your answers to your computer sheet. Note: Questions have 3, 4 or 5 choices. 1. Some people do not understand how viruses are different than bacteria; they just call them all bugs. Which of the following components would be found in bacterial cells but not in influenza virus? A. RNA B. Enzyme C. Ribosome D. Both B and C are correct 2. Why would a drug that binds and inactivates influenza hemagglutinin (HA) have the effect of slowing down virus infection? A. It would inhibit sialic acid synthesis. B. It would prevent the binding of viral particles to cells. C. It would block the action of RNA polymerase. D. It would inhibit secretion of viral proteins by the endoplasmic reticulum. 3. When does genetic reassortment occur in influenza viruses? A. When several types of virus infect the same host at the same time. B. When the virus infects birds and then swine and then humans. C. When the virus moves genes from one host to another (e.g. swine to humans). D. When the many chromosomes from one virus recombine during RNA replication. 4. Humans have been called the worlds greatest evolutionary force. Our use of vaccines against influenza has affected the evolution of this virus by providing an advantage to certain strains. Which strains would have such an advantage? A. Strains with a decreased mutation rate. B. Strains that are Tamiflu-resistant. C. Strains that are highly lethal. D. Strains with novel surface antigens. 5. The Miller-Urey experiment investigated the possible abiotic synthesis of biologically important compounds. What did the experiment find? A. That biologically important polymers could be synthesized in the absence of O . 2 B. The chemical basis for the origin of homochirality. C. That DNA can be synthesized abiotically. D. That amino acids can be synthesized in the absence of an enzyme. 6. Old biological ideas are frequently changed by new discoveries. Which of the following old ideas was changed by the discovery of ribozymes? A. All forms of life contain nucleic acid. B. All proteins are encoded by genes. C. All biological catalysts are proteins. D. All proteins are made on ribosomes. Student number _______________________ Code 111 Code 111 Code 111 Code 111 October 09 Bio 1222 Page 2 of 11 7. Which of the following statements about the history of the Earth is correct? 1. It took approximately 600 million years before life developed on Earth. 2. The nitrogen of the first nucleotides was probably derived from atmospheric ammonia (NH ). 3 3. Life developed on Earth before the atmosphere contained O . 2 4. Stromatolites are fossil evidence for the presence of animal life. A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. 1, 2, 3 and 4 are correct 8. Which of the following statements about the origin of life on Earth is correct? A. The discovery of extremophiles supported the theory of Panspermia. B. Proteins are thought to have evolved before RNA. C. Hydration shells allow proteins to interact independently of their overall charge. D. RNA is thought to be more resistant to degradation than DNA. E. Both A and C are correct. 9. Which characteristic of chiral compounds is illustrated by the drug Thalidomide? A. Chiral partners can be homochiral. B. Two molecules can be chemically, but not biologically, identical. C. Living systems synthesize chiral molecules as racemic mixtures. D. Both B and C are correct. 10. Which property of oxygen contributes to hydrogen bonding? A. strongly hydrophobic B. strong polarity C. high electronegativity D. positive charge 11. How does the Transit Method detect extrasolar planets? A. By measuring the gravitational interactions between a star and an orbiting planet. B. By directly observing planets using powerful optical telescopes. C. By measuring periodic changes in the apparent brightness of a star. D. None of the above is correct. 12. Which of the following is a potential explanation of the Fermi Paradox? A. Distances between advanced civilizations may be very small. B. Our galaxy probably contains millions of advanced civilizations. C. Communication technology may be incompatible between civilizations. D. The value of the term fl in the Drake Equation is much higher than current estimates. Student number _______________________ Code 111 Code 111 Code 111 Code 111October 09 Bio 1222 Page 3 of 11 13. Which of the following statements regarding the search for extraterrestrial life is correct? 1. Chances are that any civilization we communicate with will be more advanced than ourselves. 2. Liquid water has been found on Mars. 3. Planet formation is thought to be a natural consequence of star formation. 4. In the Drake Equation, N denotes the number of advanced civilizations in the universe. A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. 1, 2, 3 and 4 are correct 14. Which characteristic is shared by all enzymes that make DNA? 1. Can make RNA by substituting uracil for thymine. 2. Require an anti-parallel template strand. 3. Are active at
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