Micro-organisms

• Another name for micro-organisms is microbes.
• Micro-organisms can be found everywhere.
• Not all micro-organisms are harmful.
• 3 ways that micro-organisms can be useful is: to help with digestion, recycle nutrients and decaying dead organisms.
• The name given to the micro-organism that can cause disease is a pathogen.
• The 4 types of pathogens are: Virus, fungi, bacteria and protist.
• An example of a virus is COVID-19.
• An example of bacterium is Salmonella.
• An example of a fungus is athletes foot.
• An example of a protist is malaria.
• All pathogens have a simple life cycle.
• Pathogens infect their host.
• Diseases that are caused by pathogens are called viruses.
• Bacteria cell:

  
• Bacteria cells do not have a nucleus.
• The DNA in the bacterium is in the cytoplasm.
• The cell wall in a bacteria cell is made up of murein.
• bacteria cells do not contain mitochondria.
• Virus cell:

  
• A virus cell is not considered alive as it does not complete the 7 life processes.
• Different types of viruses are called strains.
• viruses do not contain a nucleus.
• The DNA in a virus is found in the protein coat.
• Antigens surround the DNA in a virus.
• 5 different ways that disease can be spread and example:

  physical contact-sexual intercourse + shaking hands.

  through the air-coughing + sneezing.

  water-drinking dirty water.

  eating contaminated food-Ecoli + salmonella.

  Vector(organism that can spread disease)-mosquito can spread malaria.