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 bodys 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.
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