Biology Topic 3

  • Created by: em3fr
  • Created on: 18-03-19 20:55
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  • Biology T3
    • Communicable disease
      • Bacteria - small living cells - make you feel ill by releasing toxins
      • Viruses are not cells, they are much smaller. They damage cells
      • Protists - single celled Eukaryotes. Some are parasites
      • Fungi - grow and penetrate skin
      • Pathogens spread in air, water and direct contact
    • Viral, protist + fungal disease
      • Viral diseases
        • Measles - viral disease spread by direct contact. Cause fever and rash
        • Tobacco mosaic virus (TMV) in plants. Causes discolouration affecting photosynthesis
        • HIV - spread by sexual contact, attacks immune system
      • Fungal disease
        • Rose black spot forms yellow spots on plants, causing decrease in photosynthesis
      • Protist disease
        • malaria is caused by a protist and causes fever
    • Bacterial disease
      • Salmonella is a bacterial disease caused by toxins in undercooked food.
      • Gonorrhoea  is passed on during sexual activities
    • Fighting disease
      • Your immune system attacks pathogens
        • White blood cells engulf pathogens and digests them and form antibodies and antitoxins
    • Drugs
      • Some drugs relieve symptoms and others cure the problem
      • Bacteria can become resistant to antibodies so when treating and killing them, you have to carry on or they will duplicate
    • Monoclonal antibodies
      • Made from a type of white blood cell - B-lymphocytes
        • They only target one type of of antigen
    • Plant diseases and defences
      • If a plant has a disease they usually have stunted growth or spots of the leaves


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