Domains of Bacteria and Archaea Flashcards
Largest taxonomic group
Proteobacteria
Proteobacteria are…?
all gram negative
The genera described are either…(3)
- Unique
- Medically important
- Environmentally benefical
Pelagibater is…(3)?
- A unique marine species and very small but abundant bacteria.
Pelagus “sea”, bacter “bacterium” - Does not causes disease in humans
- Fixes nitrogen
Caulobacter is…?
A motile organism that loses its flagella to form a stalk (holdfast) and anchor to surfaces.
Hyphomicrobium is…?
An organism that forms a hypha and adheres to surfaces opposite of the hypha.
Endotoxin vs exotoxin vs enterotoxin?
Endotoxin- toxin released when the cell is lysed.
Exotoxin is secreted toxin
Enterotoxin- secreted and affects the intestinal wall (enteric)
Rhizobium (3)
- Alphapro.
- Living in the root of legumes
- Cannot nitrogen fixate
Azospirillum (3)
- Alphapro.
- Lives on the plant surface
- It can N2 fixate “AZO”
Agrobacterium (3)
- Alphapro.
- Plant pathogen
- Cannot nitrogen fixate
Nitrobacter (3)
- Alphapro.
- Nitrification NO2 –> NO3
- Chemoautotroph
What is mostly reduced in nitrogen fixation?
Ammonia
What oxidizes NH4 to NO2?
Nitrosomonas
What is N2 to NH3?
Nitrogen Fixation
Denitrification is caused by (NO3» NO)?
Thiomargarita namibiensis
Bartonella (3)
- Alphapro.
- Facultative intracellular parasite
- An infected flea bites Piper the cat! Then Piper licks my wound and I get cat-scratch fever :(
Brucella (3)
- Alphapro
- Facultative intracellular parasite
- Infects cattle and spreads to humans via phagocytosis
A facultative intracellular parasite can reproduce where? (2)
Inside or outside the cell
An obligate intracellular parasite must reproduce where?
Inside the cell
“R”ickettsia (3)
- Alphapro.
- Highly pleomorphic and obligate
- Transmitted from ticks and insects to humans causing Rocky Mountain spotted fever.
Ehrlichia (2)
- Alphapro.
2. Similar to Rickettsia
What makes Wolbachia endosymbiotic? Reproduction?
Being the most infectious bacterial genus in the world, Wolbachia can infect insects and is used for biological control. For example, Mosquitos that carry the Dengue virus cannot spread it if they are infected with Wolbachia and it does not kill the organism but it infects its eggs.
Betaproteobacteria are (2)
- All aerobic
2. Chemo auto and heterotrophs
The sulfur cycle involves which organism?
Thiobacillus organism