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Question 1 of 5
1. Question
Recount the scientific investigations that led to the discovery of viruses. Include the contributions of Adolf Mayer, Dimitri Ivanowsky, Martinus Beijerinck, and Wendell Stanley.
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Question 2 of 5
2. Question
Explain why viruses are obligate intracellular parasites.
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Question 3 of 5
3. Question
List some characteristics that viruses share with living organisms and explain why viruses do not fit our usual definition of life.
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Question 4 of 5
4. Question
Describe the evidence that viruses probably evolved from fragments of cellular nucleic acids.
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Question 5 of 5
5. Question
Define and describe mobile genetic elements. Explain why plasmids, transposons, and viruses are all considered mobile genetic elements.
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