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Bacterial & Viral Reproduction
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Bacterial & Viral Reproduction

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Transcript

  • 1. Viral Reproduction
  • 2. What are viruses?
    • A virus is a strand of hereditary material surrounded by a protein coating. Viruses don’t have a nucleus, other organelles, or a cell membrane.
    • Viruses have a variety of shapes.
  • 3. How do viruses multiply?
    • All viruses can make copies of themselves.
    • They can’t do that without the help of a living cell called a host cell .
  • 4. How do viruses multiply?
    • Then, if they enter an organism, they can multiply quickly.
    • Once a virus is inside of a host cell, the virus can act in two ways.
    • It can either be active or it can become latent, which is an inactive stage .
  • 5. Active Viruses
    • When a virus enters a cell and is active, it causes the host cell to make new viruses.
    • This process destroys the host cell.
    Click image to view movie.
  • 6. Latent Viruses
    • Some viruses can be latent, which means that after it enters a cell, its hereditary material can become part of the cell’s.
    • It does not immediately make new viruses or destroy the cell.
    • As the host cell reproduces, the viral DNA is copied.
    Click image to view movie.
  • 7. How do viruses affect organisms?
    • The virus and the place where it attaches must fit together exactly.
    • Because of this, most viruses attack only one kind of host cell.
  • 8.
    • Vaccines have been made to prevent many diseases, including measles, mumps, smallpox, chicken pox, polio, and rabies.
    Fighting Viruses
    • Vaccines are used to prevent disease.
    • A vaccine is made from weakened virus particles that can’t cause disease anymore.
  • 9.
    • Jenner noticed that people who got a disease called cowpox didn’t get smallpox.
    The First Vaccine
    • Edward Jenner is credited with developing the first vaccine in 1796.
    • He developed a vaccine for smallpox, a disease that was still feared in the early twentieth century.