Virus Practice Exam 1

Virus Practice Exam 1 - 1 YOUR NAME BIOL 497A Evolution of...

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1 YOUR NAME: ………………………………………………………………………… BIOL 497A. Evolution of Infectious Disease: Exam 1 A total of 33 marks in 75 minutes (17 questions): March 2010 1. Briefly outline the replication cycle of a typical retrovirus . (2 marks) 2. What is a viral envelope? (1 mark) 3. What are the major differences between innate and adaptive immunity? (1 mark) 4. Describe one example of natural selection acting on a virus. (2 marks)
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2 5. Explain ‘the survival of the flattest’ and discuss whether it applies to RNA viruses in nature. (2 marks) 6. Outline the reasons why RNA viruses evolve rapidly. (2 marks) 7. Outline three differences between DNA viruses and RNA viruses. (3 marks) (i) (ii) (iii) 8. Outline the two major theories for the origins of viruses. (2 marks)
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3 9. What are CTLs and what is CTL escape? (2 marks)
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