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 ____ 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? ____ 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?
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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 ____
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