1. Tuesday 4/26/16
Learning Target: Know the characteristics, reproduction and how to control viruses. Learning Outcome: Create a virus of your choice which illustrates its characteristics, reproduction and how to control it.

3. Is a virus a living organism?
Viruses do not
Grow
Have homeostasis
Metabolize
Viruses do
– Infect cells and use the cell to make more viruses
-- Cause disease in many organisms

4. Viruses are particles of nucleic acid, protein, and lipids that invade living cells and reproduce. They are composed of a core of DNA or RNA surrounded by a protein coat called a capsid.
Examples of Viruses: Influenza, colds, chicken pox, measles, polio, and AIDS.

5. 1. Shape – they come in a variety of shapes. (see next slide)
2. Size nanometers.
1 nanometer = 1 billionth of a meter.
3. Specificity = certain viruses only infect certain organisms…your dog can’t get chickenpox!

7. Retroviruses: Contain RNA as their genetic information
Retroviruses: Contain RNA as their genetic information. It is then copied to DNA. This is “backwards” or “retro”.
Viruses are considered parasites because they must infect a living cell in order to grow and reproduce.
AIDS is this type.

8. 1. Lytic Infection – a virus enters a cell, makes copies of itself and causes the cell to burst
Attaches, entry, replication (make viral parts), assembly, and release

9. Lysogenic Infection – a virus integrates its DNA into the DNA of the host cell. It may remain inactive for a period of time.
The viral DNA is called a prophage.

10. 1. Vaccine – a weakened dose of the virus
1. Vaccine – a weakened dose of the virus. When injected it usually prompts the body to produce an immune reaction to prevent illness.

11. 2. Interferon – proteins that prevent virus from attaching to your cells and reproducing.

12. 3. Antibodies – immune system proteins that attack and kill bacteria and viruses.