Chapter 18 - Viruses.

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Presentation transcript:

Chapter 18 - Viruses

What is a virus? Made of two parts

Only infect certain things Bacteriophage

Lytic Life Cycle

Viruses that go through lytic cycle Common cold Flu Measles Chicken pox Ebola Smallpox Polio

Lysogenic Life Cycle

Viruses that go through the lysogenic cycle Chicken pox Herpes Hepatitis

HIV / AIDS Retrovirus Infects white blood cells and destroys them Lysogenic life cycle

Origin of Viruses Cells came first Nucleic acids broke from an original host

Are Viruses Living? Not made of cells Can reproduce, but only inside a host Adapt / evolve Do not utilize energy