Prokaryotes are widespread on Earth



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Ch 18 4 5 and 6 Bacteria

Prokaryotes are widespread on Earth.

  • Prokaryotes can be grouped by their need for oxygen.
    • obligate anaerobes are poisoned by oxygen

Modes of Nutrition

  • Saprobes – feed on dead organic matter
  • Parasites – feed on a host cell
  • Photoautotroph – use sunlight to make food
  • Chemoautotroph – oxidize inorganic matter such as iron or sulfur to make food

Bacteria and archaea are structurally similar but have different molecular characteristics.

  • Lactobacilli: rod-shaped
  • Spirochaeta: spiral
  • Enterococci: spherical
  • Archaea have many shapes.
    • spiral, called spirilla or spirochetes

Clicker Question!

  • What shape and grouping describes the bacteria pointed out below?
  • A: Staphalacoccus
  • B: Streptobacillus
  • C: Diplococcus

Staphylococcus Bacterial

  • Streptococcus Causes Strep Throat
  • Bacillus - E. coli

Streptobacilli

Spirillum

Leptospira

Clicker Question!

  • A. Staphylococcus
  • B. Coccus
  • C. Spirillum
  • D. Bacillus
  • E. Streptococcus
  • F. Diplococcus
  • 1. _________
  • 2. _________
  • 3. _________
  • 4. _________
  • 5. _________
  • 6. _________

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