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Virus Notes 1. Viruses are not composed of cells. 2. All a virus can do is make copies of itself. A virus can’t make a copy of itself without a host cell. 3. Once a virus is inside of a host it can act in two ways. It can become active or it can become latent, which is an inactive or dormant stage. 4. Active Virus A. An active virus multiplies and destroys the host cell. B. The virus attaches to the host cell. C. The virus’s hereditary material enters the host cell. D. The hereditary material of the virus causes the cell to make viral hereditary material and proteins. E. New viruses form inside of the host cell. F. New viruses are released as the host cell bursts open and is destroyed. 5. Latent or Dorman Virus A. The hereditary material of the virus becomes part of the host cell’s hereditary material. B. As the host cell reproduces, the viral DNA is copied. C. A latent virus may be dormant for many years. D. Outside factors induce the virus to become active. When this occurs, the virus becomes active and the host cell is destroyed when the virus is released. 6, 7,8, and 9 6. Viruses affect all living things. 7. A virus that attacks a bacteria is called a bacteriophage. 8. A vaccine is used to PREVENT a disease. 9. Edward Jenner is credited with developing the first vaccine. 10. Antibiotics are used to TREAT bacterial infections. 11, 12, and 13 11.Are antibiotics effective against a virus? NO 12.A virus is made of a strand of hereditary material surrounded by a protein coat (outer covering). 13.Scientist hope to help people with genetic disorders and to find a cure for cancer by using gene therapy. Cells Alive • http://www.cellsalive.com/phage.htm