Prokaryotes are widespread on Earth

• EVERYTHING ABOUT BACTERIA

Prokaryotes are widespread on Earth.

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

• obligate aerobes need oxygen
• facultative aerobes can live with or without 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.

• Bacteria commonly come in three forms.
• rod-shaped, called bacilli

• Lactobacilli: rod-shaped

• Spirochaeta: spiral

• Enterococci: spherical

• Archaea have many shapes.

• spiral, called spirilla or spirochetes

• spherical, called cocci

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. _________