1. E.coli on small intestines
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Helpful Bacteria
E.coli on small intestines

2. Introduction to Bacteria
2 TYPES OF BACTERIA:
Bacteria
-Get food from an outside source
Blue-green Bacteria
-Make their own food

3. Bacteria are classified by shape into 3 groups:
3 Shapes of Bacteria
Bacteria are classified by shape into 3 groups:
Spiral:
spirilla
rod-shaped: bacilli, bacillus
Round:
cocci

4. Bacillus anthracis – (bacillus) 3 Shapes of Bacteria
Neisseria meningitidis (coccus)
Leptospira interrogans – (spirilla)

5. 7 Major Structures of a Bacteria Cell
Capsule
Cell wall
Ribosomes
Nucleoid
Flagella
Pilli
Cytoplasm

6. 7 Major Structures of a Bacteria Cell
Capsule
keeps the cell from drying out and helps it stick to food or other cells

7. 7 Major Structures of a Bacteria Cell
Cell wall
Thick outer covering that maintains the overall shape of the bacterial cell

8. 7 Major Structures of a Bacteria Cell
Ribosomes
cell part where proteins are made
Ribosomes give the cytoplasm of bacteria a granular appearance in electron micrographs

9. 7 Major Structures of a Bacteria Cell
Nucleoid
a ring made up of DNA

10. 7 Major Structures of a Bacteria Cell
Flagella
a whip-like tail that some bacteria have for locomotion

11. 7 Major Structures of a Bacteria Cell
Amimation of E.coli

12. Pilli 7 Major Structures of a Bacteria Cell
hollow hair-like structures made of protein
allows bacteria to attach to other cells.
Pilli-singular
Pillus-plural

13. 7 Major Structures of a Bacteria Cell
Cytoplasm
clear jelly-like material that makes up most of the cell

14. Reproduction of Bacteria
Binary Fission- the process of one organism dividing into two organisms
Fission is a type of asexual reproduction
Asexual reproduction- reproduction of a living thing from only one parent
How?...
The one main (circular) chromosome makes a copy of itself
Then it divides into two
www-raider.stjohns.k12.fl.us/.../ sv16.html

15. BINARY FISSION Bacteria dividing Completed Reproduction of Bacteria
Bacteria dividing
Completed

16. Reproduction of Bacteria
The time of reproduction depends on how desirable the conditions are
Bacteria can rapidly reproduce themselves in warm, dark, and moist conditions
Some can reproduce every 20 minutes
(one bacteria could be an ancestor to one million bacteria in six hours)

17. Binary Fission Bacterial Cell & Nucleiod DNA Ring DNA replication
Cell wall synthesis
Cell separation

18. Bacteria Survival
Endospore-
a thick celled structure that forms inside
the cell
they are the major cause of food poisoning
allows the bacteria to survive for many years
they can withstand boiling, freezing, and extremely dry conditions
it encloses all the nuclear materials
and some cytoplasm

19. Endospore-the black section in the middle
Bacteria Survival
Bacillus subtilis
Endospore-the black section in the middle
highly resistant structures
can withstand radiation, UV light, and boiling at 120oC for 15 minutes.

20. Bacteria Survival – Food sources
parasites – bacteria that feed on living things
saprophytes – use dead materials for food (exclusively)
decomposers – get food from breaking down dead matter into simple chemicals
important- because they send minerals and other materials back into the soil so other organisms can use them

21. Ecoli movement animatoin
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Strep animation
Ecoli movement animatoin

22. Ecoli movement animatoin

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HIV movie