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Virus and bacteria
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Virus and bacteria

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Virus and bacteria

Virus and bacteria

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  • 1. Virus and bacteria
  • 2. Virus - definition
    • Virus - from the Latin virus means toxin or poison.
    • It is an infectious agent that is very small to be seen with a light microscope.
    • They are not made of cells.
    • They can only replicate inside the cells of another organism
    • Viruses infect all types of organisms
  • 3. Virus – what are they made of?
    • They consist of two or three parts:
      • Genetic Material (DNA or RNA – carry genetic information – are responsible for determining characteristics)
      • Protein Coat – to protect the genetic material
      • Some have envelope – made of fat (just like the cell membrane)
  • 4. How do they spread?
    • carried by blood sucking insects
    • spread by coughing and sneezing.
    • Through faecal – oral route
    • Passed from person to person by contact
    • Sexual contact
    • Exposure to infected blood.
  • 5. How to eliminate the virus?
    • Viral infections provoke an immune response – this will eliminate the infecting virus. (The immune system is made of white blood cells – the body’s army)
    • Vaccines – are specific.
  • 6. What does it look like?
  • 7. Replication
  • 8. Bacteria
    • Bacteria are a large group of unicellular microorganisms.
    • They have a wide range of shapes
    • They are found in every habitat
      • Soil
      • Acidic hot springs
      • Radioactive waste
      • Water
      • Deep in the ocean
      • In animals and plants
  • 9. Bacteria
    • Most bacteria in our body are harmless
    • A few species cause infectious diseases
      • Cholera
      • Syphilis
      • Anthrax
      • Leprosy
      • Bubonic plague
  • 10. In the industry
    • Sewage treatment
    • Production of cheese and yoghurt
    • Making antibiotics.
  • 11.
    • Bacteria are prokatyotes
  • 12.