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Good%20vs.%20Bad%20Bacteria%20Notes

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Good vs. Bad Bacteria Notes Please write information in red. Positive and Negative Roles Bacteria is the cause of almost half of human infectious disease. – PowerPoint PPT presentation

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Title: Good%20vs.%20Bad%20Bacteria%20Notes


1
Good vs. Bad Bacteria Notes
  • Please write information in red.

2
Positive and Negative Roles
  • Bacteria is the cause of almost half of human
    infectious disease. However, they also play a
    positive, vital role to all organisms and the
    environment.

3
Importance of Bacteria
  • Decomposers
  • Agriculture- Nitrogen Fixation
  • Photosynthesis (oxygen)
  • Oil spill clean up
  • Digestion aid vitamin production
  • Foods such as cheese and yogurt
  • Medicines

4
Agriculture-Nitrogen Fixation
  • Nitrogen-fixing bacteria, are microorganisms
    capable of transforming atmospheric nitrogen (N2)
    into fixed nitrogen, water-soluble form usable by
    plants (ammonia NH3).
  • Without nitrogen fixating
  • bacteria, vegetation
  • would grow at a slower rate.
  • Mutualism

5
Importance of Bacteria Continued
  • Symbiotic relationship (Mutualism)
  • - E. coli in the intestines aid in digestion
    and produce vitamins in exchange for food and a
    warm home.

6
Bacterial Disease
  • Bacteria can be pathogens (cause disease)
  • 2 ways of causing sickness
  • 1) Break down cells for food
  • Example
  • Mycobacterium tuberculosis causes
    tuberculosis which destroys lung tissue.

7
2) Release toxins (poisons) that interfere with
the normal activity of the host - Examples
Streptococcus pyogenes Causes strep throat
releases toxins in the bloodstream which can
cause scarlet fever. Corynebacterium
diphtheriae Causes diptheria and toxins
released into bloodstream destroy tissues can
lead to breathing problems, heart failure,
paralysis, and death.
8
Biowarfare
  • Bacillus anthracis
  • Commonly known as anthrax
  • Lives in the soil
  • Forms spore
  • Can be fatal

9
Careers with Bacteria
  • Microbiologist - studies and cultures bacteria
  • Epidemiologist -Study infectious diseases and how
    they spread.
  • Food Safety Inspector- check slaughtered animal
    carcasses for disease or bacteria

10
The Germ Theory of Disease
  • In the mid-nineteenth century, Louis Pasteur and
    Robert Koch concluded that infectious diseases
    were caused by germs (bacteria and viruses).
  • This idea is now known as the germ theory of
    disease.

11
Preventing Bacterial Disease
? Good hygiene
  • ? Food Safety
  • ? Vaccine- shot of weakened or killed pathogen
  • - Prompts the body to produce immunity
  • to the disease.

12
Treating Bacterial Diseases ? Antibiotics
kills, blocks growth, and reproduction of
bacterial cells ONLY ? Many bacteria have
become resistant to antibiotics - evolution
resulting from stronger bacteria surviving
antibiotic doses - These bacteria are not
easily killed
13
Prokaryotic Life- Bacteria
  • AN OVERVIEW
  • 2 Domains Archea and Bacteria
  • Most abundant, widespread organisms on Earth
  • Small, Unicellular
  • Found everywhere
  • High rates of reproduction
  • Evolutionarily successful
  • Positive and negative roles
  • Responds to anti-biotics
  • NO NUCLEUS
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