The
bacterial
ribosomes
are
referred
to
as
70
S
ribosomes
(S=Svedberg
unit,
the
unit
of
sedimentation).
These
ribosomes
when
placed
in
a
low
concentration
of
n'1agnesium
dissociate
into
two
components
50
S
and
30
S
particles.
Each
50
S
particle
-contains
one
molecule
of
23
S
r-RNA
(ribosomal
RNA),
one
molecule
of
5
S
RNA
and
32
different
proteins
while
the
30
S
subunit
contains
one
molecule
of
16
S
r-RNA
and
21
different
proteins.
These
ribosomes,
during
active
protein
synthesis
are
associated
with
the
m-RNA
and
such
associations
are
called
polysomes.
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