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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.