TH 18, 20 BBB - TH CH 18 Viruses Multiple Choice Identify...

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TH CH 18 Viruses Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. Which of the following contributes to the emergence of viral disease? a. spread of existing virus from one host species to another b. production of new virus strains through mutation c. transformation from lytic to lysogenic activity d. A and B only e. A, B, and C ____ 2. Viruses with single-stranded RNA that acts as a template for DNA synthesis are known as a. bacteriophages. b. lytic phages. c. retroviruses. d. viroids. e. proviruses. ____ 3. Viruses are referred to as obligate parasites because a. they can incorporate nucleic acids from other viruses. b. they cannot reproduce outside of a host cell. c. they invariably kill any cell they infect. d. viral DNA always inserts itself into host DNA. e. they must use enzymes encoded by the virus itself. ____ 4. Which of the following is (are) true about viruses? a. A single virus particle contains both DNA and RNA. b. Viruses are classified below the cellular level of biological organization. c. Even small virus particles are visible with light microscopes. d. Only A and B are true. e. A, B, and C are true. ____ 5. Allolactose induces the synthesis of the enzyme lactase. An E. coli cell is presented for the first time with the sugar lactose (containing allolactose) as a potential food source. Which of the following occurs when the lactose enters the cell? a. RNA polymerase attaches to the regulator.
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Allolactose binds to the repressor protein. c. Allolactose binds to the regulator. d. The repressor protein attaches to the regulator. e. The repressor protein and allolactose bind to RNA polymerase. Refer to the treatments listed below to answer the following questions. You isolate an infectious substance that is capable of causing disease in plants, but you do not know whether the infectious agent is a bacterium, virus, viroid, or prion. You have four methods at your disposal that you can use to analyze the substance in order to determine the nature of the infectious agent. I. treating the substance with nucleases that destroy all nucleic acids and then determin- ing whether it is still infectious II. filtering the substance to remove all elements smaller than what can be easily seen un- der a light microscope III. culturing the substance by itself on nutritive medium, away from any plant cells IV. treating the sample with proteases that digest all proteins and then determining wheth- er it is still infectious ____ 6. Which treatment could definitively determine whether or not the component is a viroid? a. first II and then III b. III c. I d. II e. IV ____ 7. If you already knew that the infectious agent was either bacterial or viral, which treatment would allow you to distinguish between these two possibilities? a.
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This note was uploaded on 02/28/2010 for the course BIOMIC Bio765 taught by Professor Sangte during the Spring '10 term at Eastern Oregon.

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TH 18, 20 BBB - TH CH 18 Viruses Multiple Choice Identify...

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