micr physiology part 2
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- what are the 3 major phenotypic groups of archaea?
-
methane producing
extreme halophilic
extreme thermophilic
eucararchaeota contains all 3 - what are 4 general characteristics of methane producing bacteria?
-
1.strict aerobes
2.have some rep of all temp groups
3.most cocci and rod
4.obtain energy by methane biosynthesis - what are the 3 types of methanogenesis in archaea?
-
type 1 - co2 reducing
type 2 - methyl reducing
type 3 -aceticlastic -
in type 1 co2 is reduced to what?
what are the e donors?
what can some species use as an e donor? -
methane ch4
h2 and formate
alcohol -
in type 2 c1 comppounds are reduced to what?
where are e- obtained from? -
methane ch4
additional methyl group which is oxidized to co2 - in type 3 - acetate is converted to what?
- ch4 and c02
- methanogensis is what kind of respiration?
- anerobic respiration
- what are the substrates for methanogensis?
- fermentative products from bacteria and eucarya
- How many families and genus are halophilic?
-
1 family and 14 genus
closely related - what concentration do halophiles grow best at?
- conc of nacl higher than 1.8 most grow at 4.0
- Some halophiles are also _ with ph optimum of _
-
alkalinophiles
10 - many haloarcheae can undergo photosynthesis using what?
- bacteriorhodopsin
- how do archaea survive in high salt?
- conc of solutes is the same on outside and inside, enzymes usually require such high salt cond for activiation and may denature when too low
- the extreme thermophile archaea group includes _ and _
- thermophiles and hyperthermophiles
- many archaea extreme thermophiles have the optimum temp of _
- greater than 80 degrees
- what type of organism are extreme thermophiles? what energy sources do they use?
-
chemoautotrophs
h2 h2s and S
some use S as an e- donor others use it as e acceptor
acidoiu uniformus can use it for both