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Bacterial & Viral Reproduction
Bacterial & Viral Reproduction
Bacterial & Viral Reproduction
Bacterial & Viral Reproduction
Bacterial & Viral Reproduction
Bacterial & Viral Reproduction
Bacterial & Viral Reproduction
Bacterial & Viral Reproduction
Bacterial & Viral Reproduction
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Bacterial & Viral Reproduction

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

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