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Types of Microorganisms

Types of Microorganisms. Microbiology Unit 1. Types of Microorganisms. Bacteria. Unicellular Prokaryotes (no nucleus) Shapes: Bacillus ( rodlike ) Coccus (spherical) Spiral (corkscrew). Shapes and Arrangements. Bacteria. Cell walls composed of peptidoglycan

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Types of Microorganisms

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  1. Types of Microorganisms Microbiology Unit 1

  2. Types of Microorganisms

  3. Bacteria • Unicellular • Prokaryotes (no nucleus) • Shapes: • Bacillus (rodlike) • Coccus (spherical) • Spiral (corkscrew)

  4. Shapes and Arrangements

  5. Bacteria • Cell walls composed of peptidoglycan • Reproduce by binary fission (dividing into two cells) • Some autotrophs, some heterotrophs • Many can “swim” using flagella

  6. Archaea • Prokaryotes • Cells walls lack peptidoglycan • Extreme environments • Methanogens: produce methane as a waste product of respiration • Extreme halophiles: extremely salty environments • Extreme thermophiles: hot sulfurous water • Not known to cause human disease

  7. Fungi • Eukaryotes (cells have a nucleus & organelles) • Unicellular or multicellular • Unicellular: yeast • Multicellular: mushrooms, molds • Cell walls composed of chitin • Reproduce sexually or asexually • heterotrophs

  8. Protozoa • Unicellular • Eukaryotic • Move by • Pseudopods (false feet): amoebas • Long flagella • Numerous short cilia • Can live either free or as parasites (derive nutrients from a living host) • Reproduce sexually or asexually

  9. Algae • Photosynthetic • Eukaryotes • Sexual and asexual reproduction • Cell walls composed of cellulose (like plants) • Unicellular (for microbiology purposes)

  10. Viruses • Living??? • Acellular (not cellular) • Most only seen with electron microscope • Made of a core of DNA or RNA surrounded by a protein coat • Can only reproduce using the cellular machinery of other organisms

  11. Multicellular Animal Parasites • Helminths (parasitic worms) • Two major groups: Flatworms and roundworms • Microscopic in size during some stages of their life cycle

  12. Announcement Title announcing

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