1. Viruses

2. Viruses- Latin for “poison”
Nonliving
Don’t reproduce
Don’t utilize energy on their own
Not made up of cells
Reproduce and have a parasitic relationship with the host cell

3. Virus examples HPV , HIV Herpes, Chicken pox Measles, mumps Polio
Ebola
Mononucleosis
Cold, flu

4. Naming viruses
Named for the disease they cause(rabies, polio. Tobacco mosaic *1st plant virus)
Named for organ or tissue infected (adenoviruses: 1st detected in adenoid tissue)
Given code numbers, several viruses infecting the same host. (9 viruses infect humans. Herpes virus- type 1-8)

5. Size: 1 /2 to 1/100th the size of a bacteria cell
Cell size & scale website
B) Shape: geometric shape
- sphere, cube, helical “spiral”

6. Structure of a virus Capsid – outer protein coat Genetic material
DNA or RNA

7. Viruses

8. Reproduction- lytic cycle
Virus attaches to host cell
Injects genetic material into host cell
Destroys host cell DNA, uses own DNA to direct cell to make virus parts
Assemble virus parts to make new viruses
Lyse the cell – release new viruses into the body
Flu

9. Reproduction -Lysogenic
Similar to lytic but the host cell is not destroyed
Viral DNA/RNA combines with the host DNA/RNA
Creates prophage
Virus stays dormant
Virus can activate ANYTIME! (Stress, lack of sleep, poor nutrition) Herpes!!!

10. Treating Viruses
Interferon- a protein made by the cells to alert the immune system
Anti viral drugs (Tamiflu)- disrupts the reproduction of a virusValtrex
Vaccines- Weak or dead strain of the virus injected into our body. Stimulates our body to make antibodies against the virus. (remembers the virus)