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gen biology
module 7
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Bacteria
are the smallest known cells.
These tiny organisms live almost
everywhere.
The following are some characteristics of
bacteria:
-no nucleus
-circular DNA shaped like a
twisted
rubber
band
-no membrane-covered (or membrane-
bound) organelles
-a
cell
wall
outside the cell membrane and
with a capsule
-a
flagellum
(plural, flagella), a tail-like
structure that some bacteria use to help
them move.
Archaea
-They live in places where no
other organisms could live
(extreme/harsh conditions) such
as boiling water or hot spring,
volcanic vents, salty water.
Archaea
- (singular, archaeon) and
bacteria share the following
characteristics:
- no nucleus
-no membrane-bound organelles
- circular DNA
-a cell wall