1. What are they and are they all bad???
BACTERIA’S
What are they and are they all bad???

2. Characteristics of Bacteria
Size: Microscopic
Cell Type: Prokaryotic
Body Type: Unicellular
Found: Live Everywhere
Are they bad?
Many Cause Disease
Many are Useful

3. Body Structure: May have flagella (whips) or cilia (hairs)
Characteristics Continued
Body Structure: May have flagella (whips) or cilia (hairs)
for movement
Have a cell wall
May contain peptidoglycan (a sugar & protein polymer)

4. Archaebacteria vs. Eubacteria
Considered “true bacteria”
Have peptidoglycan.
Live almost everywhere.
Archaebacteria
Are ancient.
Lack peptidoglycan.
Live mostly in harsh environments
Salty lakes
Thick mud
Deep ocean vents
Guts of animals

5. Eubacteria Archaebacteria Food Deep Ocean Vent Compost
Hot Spring Yellowstone
Cavities

6. Sources of Energy Can be autotrophs or heterotrophs Autotrophs:
Can be anaerobic or aerobic
Fermentation:
Respiration:

7. Growth & Reproduction They can reproduce in 2 ways:
Binary Fission: splitting in half

8. Binary
Fission

9. Conjugation: swapping genes over a bridge
between two bacteria

10. Importance of Bacteria
Decomposers- breakdown dead organisms into building blocks
Nitrogen Fixation- converts N2 gas into usable nitrogen compounds
Photosynthesis (oxygen)
Oil spill clean up- transgenic bacteria digest oil
Digestion aid & vitamin production
Foods such as cheese and yogurt
Medicines

11. Harmful Bacteria Cause disease Spoil food How to Treat Antiobiotic
How to Prevent
Good hygiene
Vaccines
Prepare food correctly