Partial preview of the text
Download RNA AND TYPES and more Exams Pharmacy in PDF only on Docsity!
UNIT
I
RNA
AND
TYPES
R.KAVITHA,M.PHARM
LECTURER
DEPARTMENT
OF
PHARMACEUTICS
SRM
COLLEGE
OF
PHARMACY
KATTANKULATUR
RNA,
as
previously
mentioned,
is
an
acronym
for
ribonucleic
acid
There
are
many
forms
of
RNA
which
are
quite
similar
to
DNA.
All
types
of
RNA
are
transcribed
from
DNA
in
a
process
called
transcription
which
is
examined
in
detail
in
the
Transcription
and
Translation
section
TYPES
OF
RNA:
The
types
of
RNA
that
we
are
concerned
with
are:
Messenger
RNA
(mRNA)
Transfer
RNA
(tRNA)
Ribosomal
RNA
(rRNA)
Messenger
RNA:
mRNA
is
synthesized
on
DNA
and
contains
the
information
needed
to
build
a
protein.
mRNA
travels
from
the
nucleus
of
a
cell
to
ribosome,
the
place
where
protein
synthesis
occurs,
and
is
read
by
the
ribosome.
The
result
is
a
protein.
Hence
the
name,
messenger
RNA.
The
information
that
mRNA
carries
is
written
in
genetic
code
a
sequence
of
bases.
The
code
is
not
complicated
it's
like
a
sentence
a
series
of
words.
Each
code
word
is
called
a
codon
a
sequence
of
three
adjacent
nucleotides
that
specifies
one
of
twenty
amino
acids.
There
are
possible
codons
x
x
and
each
codon
codes
for
an
amino
acid.
The
table
below
shows
which
codons
code
for
which
amino
acids.
THE
STRUCTURE
OF
mRNA
mRNA
in
both
prokaryotic
and
eukaryotic
cells
is
divided
into
three
sections: 1.
The
Leader
(or
just
Leader)
The
Coding
Region
The
Trailer
(or
just
Trailer)
TRANSFER
RNA
