A kind of bacteria which can live in very harsh environment . They do not require oxygen and they can sustain in very hot condition ,extreme salty enviornment and deep sea hydrothermal vents . They are unicellular prokaryotes .
Image source credit -http://lady-rosales.blogspot.in/2010/08/three-domains-system-three-domain.html
Methanophiles (in sewage plant to help in breakdown of sewage ), halophiles (high conc. of salt ) and thermophiles (extreme hot areas ) are the examples of archaebacteria. These are looks like bacteria in microscope .
It differs from eubacteria in the respect of rna which is present in ribosomes and arranged differently. They are thought to be oldest living organisms on earth .
Characters -
1. It stain Gram + ve or -ve .
2. shape - sperical, lobed, spiral, rod shape
3. multiplication is asexual by binary fission or budding or fragmentation .
4. Circular DNA like bacteria and lacks histone protein .
5.GΨC content varies from 21-68%.
6. in T C arm of t- rna - pseudouridine/ 1- methyl pseudo uridine is present .
7. I t is sensitive to anisomycin and insensitive to kanamycin and chloramphenicol.
8. EF-2 reacts with diptheria toxin .
9. It obtain energy from sulphur and ammonia.
10. Methanogens live in deep mud without oxygen .
11.Halophiles can utilize light energy for the direct synthesis of ATP.
12.It is responsible for producing methane in bio gas ferementer.
13.Cell walls made up principally of pseudomurein.( N-acethyltalosaminuronic acid)Lacks D amino acids.
14.Ether linkage is present instead of ester linkage.
15.RNA pol enzyme contains 5-11 different subunits .
MCQ.
Q.Archaebacteria differ from eubacteria in
1.cell membrance structure
2.mode of nutrition
3.cell shape
4.mode of reproduction
ans. 1
Image source credit -http://lady-rosales.blogspot.in/2010/08/three-domains-system-three-domain.html
Methanophiles (in sewage plant to help in breakdown of sewage ), halophiles (high conc. of salt ) and thermophiles (extreme hot areas ) are the examples of archaebacteria. These are looks like bacteria in microscope .
It differs from eubacteria in the respect of rna which is present in ribosomes and arranged differently. They are thought to be oldest living organisms on earth .
Characters -
1. It stain Gram + ve or -ve .
2. shape - sperical, lobed, spiral, rod shape
3. multiplication is asexual by binary fission or budding or fragmentation .
4. Circular DNA like bacteria and lacks histone protein .
5.GΨC content varies from 21-68%.
6. in T C arm of t- rna - pseudouridine/ 1- methyl pseudo uridine is present .
7. I t is sensitive to anisomycin and insensitive to kanamycin and chloramphenicol.
8. EF-2 reacts with diptheria toxin .
9. It obtain energy from sulphur and ammonia.
10. Methanogens live in deep mud without oxygen .
11.Halophiles can utilize light energy for the direct synthesis of ATP.
12.It is responsible for producing methane in bio gas ferementer.
13.Cell walls made up principally of pseudomurein.( N-acethyltalosaminuronic acid)Lacks D amino acids.
14.Ether linkage is present instead of ester linkage.
15.RNA pol enzyme contains 5-11 different subunits .
MCQ.
Q.Archaebacteria differ from eubacteria in
1.cell membrance structure
2.mode of nutrition
3.cell shape
4.mode of reproduction
ans. 1
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