Viruses
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Viruses

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Viruses Viruses Presentation Transcript

  • Viruses Viruses
    • A VIRUS is a microscopic particle that gets inside a cell and often destroys the cell.
    Viruses are tiny, they are smaller than the smallest bacteria . Red blood cell 7500 nm
    • Like living things, viruses contain proteins and nucleic acids, but viruses do not act like living things.
    • Viruses do not grow, break down food, use oxygen, respond to stimuli, etc.
    • Viruses cannot function on their own.
  • Are viruses living things?
  • A virus CAN REPRODUCE inside a cell that serves as a HOST . A HOST is a living thing that a virus or parasite lives on or in.
  • So viruses force the host´s cells to make viruses instead of healthy new cells. You need to remember that cells can produce all their structures, so in certain way they are like tiny factories.
  •  
  • - Viruses The Lytic Cycle
  • Classifying Viruses
  • Based on their Nucleic Acids: RNA Viruses DNA Viruses
  • 1 chain formed by nucleotides 1 helix 2 chains formed by nucleotides 2 helix
  • Based on their SHAPE
  • CRYSTAL
  • CYLINDER
  • SPHERES
  • SPACECRAFT
  • NEW MICROSCOPY TECHNOLOGY
  • avian influenza RNA virus CYLINDER
  • CYLINDER Tobacco mosaic virus (RNA virus)
  • Hepatitis B virus (DNA virus) CRISTALS
  • Polio virus; RNA virus. CRISTALS
  • SPHERES HIV Virus (RNA virus)
  • SPHERES HIV infection
  • SPHERES HIV infection
  • Variola virus, the cause of smallpox (DNA virus) SPHERES
  • Influenza A virus (RNA virus) SPHERES
  • T4 bacteriophage (DNA virus). SPACECRAFT
  • Bacteriophage (DNA virus) SPACECRAFT