Gram +(ve) and Gram –(ve) bacteria are separated on the basis of their cell wall composition. Christian Gram, on the basis of staining behaviour of the cell wall with Gram’s stain, grouped bacteria into Gram +ve and Gram –ve type. The bacteria which retain blue or purple colour after staining are Gram +ve e.g. Bacillus subtilis and which loses blue colour is Gram –ve e.g. E. coli. In Gram –ve, stain is washed due to high lipid content in the cell having thick wall, Gram +ve has single layered cell wall rich in peptidoghycans which retain the colour.
352.
Oils and Leucosine are characteristic stored food in
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353.
In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statements is true about archaea?
A
Archaea resemble eukarya in all respects
B
Archaea have some novel features that are absent in other prokaryotes and eukaryotes
C
Archaea completely differ from both prokaryotes and eukaryotes
D
Archaea completely differ from prokaryotes
Answer :
Archaea have some novel features that are absent in other prokaryotes and eukaryotes
A domain of prokaryotic organisms containing the archaebacteria including the methanogens, which produce methane; the thermoacidophilic bacteria, which live in extremely hot and acidic environments, & the halophilic bacteria, which can only function at high salt concentrations are abundant in the world’s oceans.
Chemosynthetic bacteria do not require sunlight as a source of energy either directly or indirectly. The energy for the synthesis of food is obtained by the oxidation of certain inorganic substances present in the medium. The chemical energy obtained from oxidation reaction is trapped in ATP molecules. The ATP is used in $$C{O_2}$$ assimilation.