1. Bacteria on Earth Bacteria are in every environment imaginable!

2. Bacterial Morphology

3. largest – 50 μm in diameter smallest – 0.3 μm in diameter Figure 3.3

4. Thiomargarita namibiensis

7. Gram Staining

10. Gram-Positive Peptidoglycan Cell Membrane Peptidoglycan Cytoplasmic membrane Another cell Gram-Negative Outer Membrane Membrane Peptidoglycan Periplasm Periplasmic space

11. Figure 3.4 – Effect of Pencillin

12. Endospore

13. Bacterial Reproduction

14. Treponema denticola

15. Predatory Bacteria Bdellovibrio bacteriovorus attacking Spirillum serpens (arrow).