The role of bacteria in infection
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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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What is a prokaryote
What is a Prokaryote?

  • Unicellular

  • Lacks a nucleus

  • Small 1-5 micrometers


Bacteria are examples of prokaryotic cells
Bacteria are Examples of Prokaryotic Cells

  • Two Kingdoms

  • Eubacteria – found everywhere

  • Archaebacteria – found in harsh environments



Growth and reproduction
Growth and Reproduction

  • Binary Fission

  • Conjugation

  • Spore Formation - endospore


Importance of bacteria
Importance of Bacteria

  • Producers

  • Decomposers

  • Many human uses

Soil bacteria


Bacteria and disease
Bacteria and Disease

  • Some use cells for food

  • Example Mycobacterium causes tuberculosis


  • Some release toxins

  • Example – Streptococcus

  • Releases a toxin that can cause a rash and scarlet fever


  • Diphtheria – Corynebacterium diphtheria infects the throat and releases toxins into the bloodstream.

  • Destroys tissues can cause heart failure, paralysis and death


Preventing bacterial disease
Preventing Bacterial Disease

  • Your first line of defense against bacterial infection is your skin

  • Wash your hands


Preventing bacterial disease1
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



Control of bacteria
Control of Bacteria

  • Sterilization by heat

  • Disinfectants

  • Food storage and processing



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