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Transcript of Viruses
A virus is a microscopic particle that invades a cell and often destroys it. Many diseases are caused by viruses including the common cold, the flu, and AIDS.
Viruses are extremely small - 5billion of them can fit into a single drop of blood.
Are They Living
Similarities with living things - contain protein and nucleic acids, and reproduce (as long as they have a host)
Differences - don't eat, grow, breathe, or perform other biological functions. They cannot live on their own. They must have a living organism to invade.
The Lytic Cycle
an organism that supports a parasite with no benefit to the host organism.
The Lysogenic Cycle: a ticking time bomb
The Greatest Threat to the Survival of Humanity
Viruses can be grouped based on:
1. type of disease caused
2. their life cycle
3. the type of genetic material they contain
Shapes: cylinders, crystals, spheres, and spacecraft