Who discovered bacteria?
Antonie van Leeuwenhoek using his single lens microscope
Who called bacteria animalcules?
Antonie van Leeuwenhoek
Who introduced name bacterium?
Ehrenberg
Who proposed kingdom protista?
John hog
Who made separate group Monera for prokaryotes within protista?
Ernst haeckel
Who elevated status of Monera to kingdom level?
Herbert Copland
Who introduced five kingdom classification?
Robert h Whitaker
Who modified five kingdom classification?
Lynn margulis and schwartz
Define phylogeny?
The evolutionary relatedness among various group of organisms is called phylogeny
Why rRNA are called molecular clocks?
Because rRNA help in construction of phylogeny
What are the two main domains of prokaryotic life?
Prokaryotic life is divided into two separate domains
~eubacteria(true bacteria)
~archeabacteria(ancient bacteria)
What is composition of cell wall of archaebacteria?
There is no peptidoglycan .Mainly composed of polysaccharide or protein.in some there is no cell wall
What do you know about cell membrane of archaebacteria?
Cell membrane of archea contain unusual lipids that help them to function at high temperature (120°c)
Lipids contain glycerol linked to branched chain hydrocarbons
Diff between lipid of eubacteria and archaebacteria?
Lipid of archea consist of glycerol attached to branched chain hydrocarbon while lipid of eubacteria consist of glycerol attached to fatty acids
Which metabolism is performed exclusively by archea?
Methanogenesis=ability to form methane
Write any 5 diff b/w eubacteria and archaebacteria?
1.The rRNA sequence of archea match to eukaryots while that of bacteria match to eubacteria.
2.introns are absent in true bacteria while present in archea
3.The membrane lipids of archea contain branched carbon chain while that of eubacteria contain unbranched carbon chain
4.peptidoglycan is absent in archea
5.RNA polymerase of archea is complex similar to eukaryots
Write three types of archea?
Methanogens~found in anaerobic environment
Halophiles~found in extreme salty environment
Thermo acidophiles ~fiund in extremely hot environment
What is mode of nutrition in archea?
Archea are autotrophs but they do not perform photosynthesis they prepare food by sunlight,by inorganic and organic compounds
Name one photosynthetic bacteria?
Cyanobacteria
What is type of cell wall of cyanobacteria?
Gram negative type cell wall
Who was introduced oxygen in primitive environment?
Cyanobacteria
How cyanobacteria performs photosynthesis?
Photosynthesis occur in thylakoids .
On thylakoids chl a and phycocyannnin (blue phycobilin-an accessory pigment) are also present.
They use carbon dioxide as a source of carbon,water as a source of hydrogen and both photosystems( non cyclic phosphorylation)
Do cyanobacteria can fix nitrogen?
About 1/3 rd of cyanobacteria are able to fix nitrogen
Give 2 examples of cyanobacteria?
Nostoc and Anabaena
