Polypeptide Synthesis and Meiosis | PPT

POLYPEPTIDE SYNTHESIS AND MEIOSIS

PART A

TRANSCRIPTION
Cytosol for
prokaryotes
and nucleus for
eukaryotes
Enzymes
used: RNA
polymerase to
synthesize
single stranded
RNA.
Direction:
Single stranded
RNA
transcribes in
5’-3’ direction
and new
nucleotide is
added to 3’ end
(Ferraro
et al.
Fig 1: Structure
generated from
RASMOL
Nucleotid
e base
Sugar
backbon
e
Phospho
diester
backbon
eFig 2: Zoomed view for the DNA structure
obtained from
TACGATCCCGGACAGAGTCATACAGTGATC
The process of
addition of
nucleotide to the
growing RNA chain.

RNA PROCESSING
Fig 3: Processing of mRNA
Source: Zhao, Roundtree and He (2017)
 Capping at the 5’ end- The capping of mRNA
by 7- methyl guanosine.
 The addition of polyA tail at the 3’ end (Zhao,
Roundtree and He 2017).
 Removal of the introns by splicing- Introns are
spliced out leaving the exons inside the
matured RNA.