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Notes - Viruses What is a virus? An extremely small, _____________ particle that causes ____________ in living things Are viruses alive? ____ Viruses are not living things. They do not have all of the characteristics of life. Seven traits of viruses: 1. Made of ____________ ______________ (DNA or RNA) surrounded by a _____________ Coat (Capsid). 2. Can ______________, but only inside of ____________ things. 3. No __________ parts. 4. Extremely _____________ (Can only see with ____________ microscope). 5. Specific to an ______________ and _______ type. 6. Come in a __________ of ______________. 7. _________________ (usually cause damage to the host). Viruses can cause disease in all living things. Some examples of viruses infecting nonhumans are: Examples of diseases caused by viruses in humans: Treatment for viral infections: - Viruses can only be ________________ with _______________. - In some cases _______________ drugs can slow down the virus to give immune system time to ______________. Edward Jenner – First _______________ ever, for ______________. - You had to get sick to be _______________ Jonas Salk – Vaccine for _____________, you did not have to get sick to be protected. There are two main types of viral life cycles: 1.) The Lytic Cycle – Leads to rapid cell ______________. Causes host cell to make copies of virus. Then cell ________________ 2.) The Lysogenic Cycle – Involves a ______________ period, where cell does not know it is ________________. RNA Viruses vs. DNA Viruses RNA Viruses - ________________, frequently change DNA Viruses - ____________ and unchanging.