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Virus Notes

Virus Notes. Kingdom journal pages 9-13. Definition. non-living particle that is composed of nucleic acids enclosed in a protein coat. Unique Traits. Do not show all characteristics of life (growth, energy use, homeostasis, etc), so are considered non-living

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Virus Notes

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  1. Virus Notes Kingdom journal pages 9-13

  2. Definition non-living particle that is composed of nucleic acids enclosed in a protein coat

  3. Unique Traits • Do not show all characteristics of life (growth, energy use, homeostasis, etc), so are considered non-living • Must replicate inside a host cell, which can be any living organism. Viruses though are specific for each host. • Vaccines are used to prevent future viral infections by giving a dead or weak version of the virus to cause the body’s immune response to create antibodies against that virus.

  4. Most Common Human Viruses • HIV--AIDS • Adenovirus—common cold • Influenza—Flu • Herpes • Poliovirus—Polio • Hepatitis B and HPV are viruses that can cause mutations that lead to cancer.

  5. Means of Reproduction • Must occur within a host cell. The virus takes over and makes the cell build all the new viruses. • Lytic cycle—occurs immediately after infection • Lysogenic cycle—waits within host DNA

  6. Viral Structure and Function • Genetic Material/RNA or DNA—code for making new viruses • Capsid—protein coat that protects genetic info • Envelope—helps to infect host, not present on all viruses (projects help the virus to blend, so the body does not create an immune response)

  7. Means of Reproduction • Must be within a host cell • Lytic cycle—virus infects a cell and immediately takes over the cell. The host copies the viral genetic code, makes new protein coats, and assembles the new viruses until they burst out the cell. • Lysogenic cycle—virus infects cell, but its DNA waits within host’s DNA until the cell is under stress and then switches to the lytic cycle.

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