PLP 405 Lecture 7 Review and Discussion Questions 1. What are viruses? How are these pathogens detected in plant tissues? 2. What types of symptoms do viruses cause in plants? 3. Describe viruses in terms of their size, shape (morphology) and chemical composition. How do viruses compare to bacterial, fungal and oomycete pathogens? 4. What is a viroid? In what ways do they resemble viruses and in what ways do they differ? 5. How do viruses infect cells? 6. Using a virus that contains single stranded positive RNA as its genetic material, explain how viruses
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