36_pdfsam_apluspreptt1pkg - Select the best answer A None...

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D. 3, 5 E. 4, 5 28. Which statement(s) is/are true about nature of viruses? 1. Only the largest viruses, such as vaccine virus, can be visible by light microscope 2. Some viruses code for lipids 3. Rubella Viruses can cause neonatal malformation by placental transmission 4. Carbohydrates can confer resistance to degradation by nucleases 5. Polyamine containing viruses lose their infectivity by treatment with organic solvents like ether and chloroform Select the best answer: A. None of the above B. 1,2, 3 C. 3 D. 3, 4 E. 4, 5 29. Which statement(s) is/are true about viroids and virusoids? 1. Actinomycin D inhibits the replication of virusoids 2. Some viroids utilize both DNA dependent RNA polymerases and capsid proteins of the helper viruses 3. Dicer never cleaves viroids as none of their double-stranded regions are more than 21 nucleotide long 4. Most viroids require cellular ribonuclease and cellular RNA ligase to cleave concatamers and circularize linear copies of viroid RNAs 5. Viroids are found only in plants
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Unformatted text preview: Select the best answer: A. None of the above B. 1, 2, 3 C. 1, 4, 5 D. 3 E. 4, 5 30. Which of the following statement(s) is/are true? 1. Human Rhinoviruses are sensitive to acid and cannot be transmitted through environmental surfaces like door knobs 2. Nausea, vomiting, abdominal cramps, and sore throat are characteristic clinical symptoms of Coxsackie A Viruses 3. Hepatitis A Virus (HAV) is highly resistant to acids and high temperatures, but the optimal growth temperatures for HAV is 33° C 4. Animal and bacteria Picornaviruses usually have 4 types of coat protein 5. Chimpanzees can be infected by all of Polioviruses, Coxackieviruses, Cardioviruses, Echoviruses, Human Rhinoviruses, and Human Hepatitis A Virus Select the best answer: A. None of the above B. 1 C. 1, 2, 3 D. 3 E. 5 31. Which statement(s) is/are true about isolation and purification of viruses? 1. Smaller viruses have lower diffusion coefficient (D) compared to larger viruses © 2006. A+PREP, Inc....
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