1. PART I Chapter 18 Archaebacteria & Eubacteria

2. Phylogeny

3. Characteristics First living evidence on earth Unicellular Prokaryotes (No membrane-bound organelles) Cell wall with internal plasma membrane Found everywhere

4. Bacteria

5. Special Features Pilus/pili - hairlike protrusion –to stick to surfaces –a bridge for sexual reproduction Flagellum - long, whiplike protrusion, for moving Capsule - sticky layers around cell wall Toxin - a powerful poison Endospore – found in some bacteria –resists harsh environments

6. Flagella

7. Capsules

8. Endospores

10. Classification: Shape –Cocci (Spheres), Bacilli (Rods), Spirilli (Spiral) Gram stain - Cell wall type –Thick = Purple Stain = “Gram Positive” –Thin = Pink Stain = “Gram Negative” Growth patterns –Diplo- pairs –Staphylo- clusters –Strepto- chains

11. Shapes

12. Gram Stain

13. Growth Patterns

14. Streptococci

15. Pneumonia

16. PART II Chapter 18 Archaebacteria & Eubacteria

17. Archaebacteria – ancient bacteria Methanogens Live in: Oxygen-free env. Produce methane gas Halophiles Live in: Salt water Acidophiles: Live in: Hot, acidic water

18. Eubacteria - “True” bacteria Live in more habitable environments Heterotrophs Photosynthetic Autotrophs Chemosynthetic Autotrophs Saprophytes (decomposers) Need sunlight to make food Need sulfur & nitrogen to make food Parasites (cause disease) Example: Cyanobacteria Nitrogen fixation (FIX the nitrogen)

19. Cyanobacteria - “blue-green bacteria” Algae + Bacteria

20. Sulfur Bacteria

21. Beneficial Bacteria Nitrogen fixation –Converts nitrogen into ammonia –a form that plants can use Nodules –A symbiotic relationship between bacteria and plants

22. (Beneficial Bacteria) Saprophytes (decomposers) –Breaks down dead organisms and decaying matter –Returns nutrients to soil

23. (Beneficial Bacteria) Make food: –Cheese –Pickles –Yogurt –Vinegar –Sauerkraut

24. Cellular Respiration Obligate Aerobes Obligate Anaerobes Need OxygenDie from Oxygen

25. Pathogenic Bacteria – disease-causing bacteria Pathogen – an organism that causes disease Produce toxins Damage host’s tissues Enter through openings in body (via air, food, water)

26. Antibiotics: ~ Destroys cell wall of bacteria ~ Creates holes in the cell walls Sir Alexander Fleming 1928 - discovered Penicillium notatum

27. Air-Born

28. Air-Born Bacteria

29. Reproduction Asexual Binary Fission –Cell division Rapid - 20 min. Sexual Conjugation – exchange genetic material Pili/pilus - bridge

30. Binary Fission: Asexual Reproduction

31. Conjugation - Sexual Reproduction