General characteristics:
a)They are cosmopolitan in distribution, i.e. found everywhere.b) They have prokaryotic cell, i.e. lack of true nucleus and membrane bound organelles.

c)  They have circular DNA.

d) They have rigid cell wall.

e) Most of the species are heterotrophic and some are autotrophic.

f) Reproduction by vegetative and asexual method.

g) They are known as decomposer of the environment, and help to increase the fertility of the soil.


There are two types –

  1. Archaebacteria     (Ancient
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