| A | B |
|---|
| Eubacteria | True bacteria |
| Cyanobacteria | Blue-green bacteria |
| Archaebacteria | Oxygen-free; harsh conditions |
| Prochlorobacteria | Contains chlorophyll |
| Moneran | Prokaryotic, unicellular organism |
| Rod | Bacillus |
| Sphere | Coccus |
| Spiral | Sprilla |
| Phototrophic autotrophs | Trap sunlight; photosynthesis |
| Chemotrophic autotrophs | Obtain energy from inorganic molecules |
| Chemotrophic heterotrophs | Obtain energy from organic molecules |
| Phototrophic heterotrophs | Photosynthetic but need organic molecules |
| Obligate anaerobes | Requires the absence of oxygen |
| Obiligate aerobes | Requires oxygen |
| Facultative anaerobes | Do not require oxygen but can tolerate it |
| Binary fission | Asexual division |
| Conjugation | Sexual reproduction; exchange of genetic information |
| Spore formation | Form spores to reproduce |
| Gram-stain positive | Single, thick cell wall; crystal violet |
| Gram-stain negative | Additional layer; safranine |
