1. Bacteria Chapter 21

2. Bacteria are VERY small! http://mrbarlow.files.wordpress.com/2008/10/bacteria-on-a-pin.jpg

3. Euglena 100 µm Plant cell 35-80 µm Animal cell 5-30 µm Spirocheta 10 µm Bacteria are small compared to cells with nuclei Virus 20-200 nm

4. Bacteria compared to white blood cell that will eat it!

6. Structure of Bacteria Carries genetic information. It is circular Chromosome Contains DNA, ribosomes, essential compounds Cytoplasm Regulates movement of materials, contains enzymes important to cellular respiration Cell Membrane Protects against antibodies Outer Membrane Protects and gives shape Cell Wall Function Structure

7. Structure of Bacteria Contains some genes obtained through recombination Plasmid Protects the cell and assist in attaching cell to other surfaces Capsule & Slime Layer Protects cell against harsh environments Endospore Assists the cell in attaching to other surfaces Pilus Moves the cell Flagellum

9. Bacillus bacteria are rod shaped

10. Spirillium bacteria have a corkscrew shape

11. Coccus bacteria are sphere or ball shaped

12. Staphylobacteria occur in clumps, such as this staphylococcus bacteria that cause common infections of cuts

13. Diplo-bacteria occur in pairs, such as the diplococcus bacteria

14. Streptobacteria occur in chains, like this streptococcus bacteria

15. Bacterial Reproduction: Binary Fission

20. Gram Stain- Another way to identify Bacteria Purple= Gram Positive Pink= Gram Negative