Question

short note of archaebacteria

Answer 1

archaebacteria are the most primitive bacteria, probably by the first form of life, which evolve in a different line from that of true bacteria. These are adapted extreme conditions like pH, temperature, salinity. they differ from true bacteria by cell wall lacks murein, cell membrane with lipids (glycerol isopronyl ether) of branched alipathic chains, smaller size of DNA and base constituents in the RNA. These are of three types- Methanogens (methane producing, cause explosion in coal mines), Halophiles (live in extreme saline conditions, contain purple pigment bacteriorhodopsin for ATP synthesis from sunlight) and Thermophiles or Thermoacidophiles (withstand high temperature and acidity, mostly grow in hot sulphur springs)

Answer 2

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ARCHAEBACTERIA:

• These are most primitive type of bacteria.

• Cell membrane contains branched chain lipids.

• They can bear extremes of heat and pH.

• Archaebacteria includes Halophiles, Thermoacidophiles and methanogens.

→ Halophiles: Live in extreme salty areas.

→ Thermoacidophiles: Found in hot springs.

→ Methanogens: Obligate anaerobes, found in Marshy areas.