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Lab 2: Microbiology

Bio II

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Lab 2: Microbiology

  1. 1. Types of Cells • What is the difference between a prokaryotic and a eukaryotic cell? • Which cell type is more primitive?
  2. 2. What are the three domains of life? • Which domains contain organisms with prokaryotic cells?
  3. 3. General Bacteria •Capsule: protection •Fimbriae: adhesion •Cell wall: protection •Pilus: transfer of DNA to other cells •Plasmid: extra DNA, creates antibiotic resistance •Endospore: dormant, non reproductive resting state
  4. 4. Colony • Bacterial cells descended from one original cell
  5. 5. Three basic cell shapes • Cocci (spherical) • Bacillus (rod-shaped) • Spirilli (spiral)
  6. 6. Cyanobacteria (Domain bacteria) • Previously called blue-green algae • Photosynthetic (thylakoid membranes) • Examples: 1. Gloeocapsa Secretes gelatinous sheath 2. Oscillatoria Exhibits oscillation movement 3. Anabaena Forms heterocyst to obtain nitrogen
  7. 7. Kingdom Protista (Protists) • Domain eukaryota • Eukaryotic cells • Single and multi celled organisms – Many microscopic • Great diversity
  8. 8. Euglenozoans • Asymmetric, single celled • Euglena sp. – Exhibits movement (flagellum) – Both autotroph and heterotroph • Trypanosoma sp. – Parasite carried by the Tsetse fly that causes African sleeping sickness
  9. 9. Brown Algae (Stramenopiles) • Autotrophs – Have carotenoid pigments • Example: Fucus (common seaweed) – Reproduces sexually • Example: Kelps
  10. 10. Red Algae (Archaeplastida) • Autotrophs – Photosynthesis with phycoerythrin pigment • Smaller than brown algae • Grow in warm seawater • Complex branching
  11. 11. Green Algae (Archaeplastida) • Autotrophs – Use chlorophyll pigment – Closely related to green plants • Example: Spirogyra – Filamentous – Sexual reproduction: conjugation • Example: Volvox – Colonial – Motile with flagella – Sexual and asexual reproduction
  12. 12. Other photosynthetic protists • Diatoms (golden-brown algae) – Cell wall contains silica (glass) • Dinoflagellates – Two flagella
  13. 13. Ciliates: Paramecium (Alveolates) • Heterotrophs • Exhibit movement through cilia • Example: paramecium – Sexual and asexual reproduction
  14. 14. Tubulinids: Amoeba (Amoebozoa) • Heterotrophs • Exhibit movement through pseudopods (cytoplasmic streaming) Amoeba

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