Unit 3 Domain Bacteria

Taxonomy

Science of classification of living organisms

Nomenclature

Grouping by characteristics

Systematics

Organizing organisms in a hierarchy

Low G+C gram (+) bacteria

Less than 50% DNA made up of guanine and cystosine

High G+C gram (+) bacteria

High content of guanine and cytosine in DNA, found in soil, filamentous *actinobacteria (look like fungus) example of Mycobacterium

Proteobacteria

Rickettsias (rickets), Neisseria (gonorrhea), Bordatella, Legionella, Pseduomonos, Enterobacter, Vibrio (cholera)

Non-proteobacteria

Mostly found in oceans and waterways, most are photosynthetic, Cyanobacteria

Gram-positive bacteria

Firmicutes- clostridium, bacillus, staphylococcus Actinobacteria- Corynebacterium, Mycobacterium

Chlamydiae

Sexually transmitted diseases, Chlamydia, Chlamydophila

Spirochetes

• corkscrew morphology, Borrelia (lime disease)

Bacterioidetes

Prevotella (GI and oral cavity), bacteroides

Fusobacteria

Fusobacterium (intestine)

Chemoheterotroph

Obtains carbon from organic molecules (ex: humans ingesting food)

Photoautotroph

Use light as energy source and CO2 in air for carbon source (non-proteobacteria and plants)