Topic 7

Question 1

Proteobacteria

Answer 1

Gram neg
most common bacteria
-chemolithotrophs, chemoorganotrophs, phototrophs
-morphologically diverse (alpha, beta, omegam gamma and delta

Question 2

The main groups

Answer 2

PROTEOBACTERIA

PSEUDOMONAS

Question 3

Anozygeneic photosynthesis

Answer 3

-photosynthesis inhibited by o2
-wavelength determined by bacteriochlorophylls and cerotenoids

Question 4

Purple sulfur bacteria

Answer 4

Photoautotrophs of GAMMAPROTEOBACTERIA
oxidize H2S-> S during co2 reduction

Question 5

Winogradsky column

Answer 5

Photoautotrophs of gammaproteo bacteria

From top to bottom
Cyanobacteria (o2) so at top
Purple NONSULFUR bacteria
Purple sulfur bacteria
green sulfur bacteria
fermenters, iron, sulfate reducers

Question 6

Methyltrophs and methanotrophs

Answer 6

Methyltrophs: Oxidize C1 compounds
-non-organic, no c-c bonds ex ch2oh

Methanotrophs:
oxidizes methane to methanol
-methane mono-oxyeneate does this
-NEED O2, obligate aerobes
-need o2 and c1

found in aquatic habitats, space between where methane formed (Anoxic) and oxygen needed
-found in catal rumen and swamps

Question 7

Nitrifiers

Answer 7

AZOTOBACTER
Used reduced N as e- source
(chemolithoautotrophs)
-nitroSOcoccus or anything with nitroSO: so are ammonia oxidixers
-Nitrobacter: nitrite NO2 oxidizers
(have intercytoplasmic membrane that houses this bacteria)

NH3 to NO2 to No3

Question 8

FISH

Answer 8

detect nitrifying bacteria using this

fluorescently tagged
Ammonia oxidixing: red
Nitrite oxidizing: Green

Question 9

Nitrospira

Answer 9

originally thought bactera can only exist doing either ammonia oxidiation OR nitrite oxidation, however, this bacteria is a commammox bacteria, so it can do both

REMEMBER THIS CUZ u may think its a nitrite oxidizer due to name but it is actually a nitrite and ammonia oxidizer

Question 10

PSEUDOMONONAS