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The Role of Bacteria in Infection

The Role of Bacteria in Infection. M. Stafford. What is a Prokaryote?. Unicellular Lacks a nucleus Small 1-5 micrometers. Bacteria are Examples of Prokaryotic Cells. Two Kingdoms Eubacteria – found everywhere Archaebacteria – found in harsh environments. Shapes of Bacteria.

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The Role of Bacteria in Infection

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  1. The Role of Bacteria in Infection M. Stafford

  2. What is a Prokaryote? • Unicellular • Lacks a nucleus • Small 1-5 micrometers

  3. Bacteria are Examples of Prokaryotic Cells • Two Kingdoms • Eubacteria – found everywhere • Archaebacteria – found in harsh environments

  4. Shapes of Bacteria

  5. Growth and Reproduction • Binary Fission • Conjugation • Spore Formation - endospore

  6. Importance of Bacteria • Producers • Decomposers • Many human uses Soil bacteria

  7. Bacteria and Disease • Some use cells for food • Example Mycobacterium causes tuberculosis

  8. Some release toxins • Example – Streptococcus • Releases a toxin that can cause a rash and scarlet fever

  9. Diphtheria – Corynebacterium diphtheria infects the throat and releases toxins into the bloodstream. • Destroys tissues can cause heart failure, paralysis and death

  10. Preventing Bacterial Disease • Your first line of defense against bacterial infection is your skin • Wash your hands

  11. Preventing Bacterial Disease • Vaccine – a weakened or killed pathogen that is used to stimulate the body’s immune system • Antibiotic – blocks the growth and reproduction of bacteria

  12. Fleming - penicillin

  13. Control of Bacteria • Sterilization by heat • Disinfectants • Food storage and processing

  14. Video – Killer microbe • 8 minutes

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