Viruses.

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Viruses Virus- an infectious agent made up of a core of nucleic acid and a protein coat.

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Presentation transcript:

Viruses

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

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

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)

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

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

Viruses

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

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!!!

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)