Bacteria and Disease• A pathogen is a disease-causing  agent.• Bacteria can damage the tissues  of the affected organism d...
Antibiotics• Compounds that block the  growth and reproduction of  bacteria.• Examples: penicillin &  tetracycline
Common Diseases Caused byBacteriaDisease                     Pathogen                     PreventionTooth decay           ...
Controlling Bacteria• Sterilization – destroys bacteria  by subjecting them either to great  heat or chemical action.• Dis...
Controlling Bacteria• Food is refrigerated because  bacteria grow slower at low  temperatures.• Food can be sterilized by ...
Helpful Bacteria:Nitrogen fixation(Nitrogen Cycle)  convert nitrogen gas into nitrates in  the soil used by plants
Helpful BacteriaSaprobes:   break down dead organic matter (decomposers)Food flavorings:         produced by fermentation ...
Antibiotic production:some bacteria produce antibioticsthat will kill other forms ofbacteriaBioremediation – help clean-up...
Helpful Bacteria• Provide Vitamin K (E coli)- clots  blood & keeps bones strong• Keep invading bacteria, viruses,  & yeast...
Bacteria Reproduction• Binary fission – asexual reproduction. The prokaryote replicates DNA and divides in half. (Mitosis)
• Conjugation – sexual reproduction. A hollow bridge forms between two cells and genes move from one cell to another. (Inc...
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Bacteria two

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Bacteria two

  1. 1. Bacteria and Disease• A pathogen is a disease-causing agent.• Bacteria can damage the tissues of the affected organism directly or release toxins that harm the body.
  2. 2. Antibiotics• Compounds that block the growth and reproduction of bacteria.• Examples: penicillin & tetracycline
  3. 3. Common Diseases Caused byBacteriaDisease Pathogen PreventionTooth decay Streptococcus mutans Regular dental hygieneLyme disease Borrelia burgdorferi Protection from tick bitesTetanus Clostridium tetani Current tetanus vaccinationTuberculosis Mycobacterium tuberculosis VaccinationSalmonella food poisoning Salmonella enteritidis Proper food-handling practicesPneumonia Streptococcus pneumoniae Maintaining good healthCholera Vibrio cholerae Clean water supplies
  4. 4. Controlling Bacteria• Sterilization – destroys bacteria by subjecting them either to great heat or chemical action.• Disinfectants are chemical solutions that kill bacteria.
  5. 5. Controlling Bacteria• Food is refrigerated because bacteria grow slower at low temperatures.• Food can be sterilized by cooking at high temperatures.
  6. 6. Helpful Bacteria:Nitrogen fixation(Nitrogen Cycle) convert nitrogen gas into nitrates in the soil used by plants
  7. 7. Helpful BacteriaSaprobes: break down dead organic matter (decomposers)Food flavorings: produced by fermentation vinegar, yogurt, cheese, sour cream, pickles, sauerkraut
  8. 8. Antibiotic production:some bacteria produce antibioticsthat will kill other forms ofbacteriaBioremediation – help clean-up oil spillsWorks in Landfills to break downwastes (including some hazardouswastes)Waste- water treatment plants
  9. 9. Helpful Bacteria• Provide Vitamin K (E coli)- clots blood & keeps bones strong• Keep invading bacteria, viruses, & yeast in check.• Make Lactase-enzyme needed to break down dairy products
  10. 10. Bacteria Reproduction• Binary fission – asexual reproduction. The prokaryote replicates DNA and divides in half. (Mitosis)
  11. 11. • Conjugation – sexual reproduction. A hollow bridge forms between two cells and genes move from one cell to another. (Increases diversity.)
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