Diseases and Pathogens

1. Fungi
   1. Useful as decomposers
   2. Yeast

      Nota:

      • Yeast is used in a variety of culinary practices and to make bread, beer and wine.
2. Bacteria

   Nota:

   • For more about useful Bacteria: http://science.howstuffworks.com/life/cellular-microscopic/bacteria-info3.htm
   1. Organic fertilizers are broken down by bacteria
   2. Making Cheese
3. Viruses
   1. The cowpox virus makes people immune to measles

      Nota:

      • For info about this click: http://microbemagic.ucc.ie/about_microbes/more_info/good_viruses.html

1. Vary in shape
2. Reproduce very quickly
   1. Divide over and over again
3. Have a size of about 1/1000mm
4. Bacteria can produce poisons called toxins
   1. Food poisoning is caused by this
5. Physical properties of a bacteria
   1. No distinct Nucleus
   2. Cell wall
   3. Has cytoplasm

1. They reproduce by making spores that can be carried about from person to person
2. Cause diseases like athletes foot and ringworm
3. Do not confuse fungi with mushrooms, these are very small
   1. Sometimes they look like a net draped across whichever part of the inside of your body it is currently residing in.

1. Viruses are on the border between the living and the non-living (dead sounds spooky)
   1. They don't feed, move, respire or grow.
   2. They just reproduce
2. They are much smaller than bacteria
   1. They are about 1/10,000mm
3. They consist of a few genes surrounded by a protein coat
4. Viruses can only reproduce if inside another living cell
   1. They release thousands of new viruses to infect new cells
   2. They kill the cell they are inhabiting at the same time
5. They vary in shape

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• Defence Against Diseases