Transcription and Translation
IB Biology
Can you match the pictures with the
statements?
3
4
1
2
Role of mRNA
• Carries genetic information from DNA
• Delivers it to organelle in cytoplasm
responsible for protein synthesis
• Formed from one of the DNA strands using
free RNA nucleotides present in the cell’s
nucleus
Transcription process
• Similar to semi-conservative
replication
• DNA polymerase replaced by RNA
polymerase to form sugar-phosphate
backbone
• Completed mRNA leaves nucleus
through pore in nuclear membrane and
enters cytoplasm
• Each triplet of bases on mRNA is
called a codon
• mRNA formed by complementary base
pairing with DNA
GROUP ACTIVITY!
Now fill in the Transcription part of
your review sheet!
Ribosomes
• Small spherical structures found in all cells
• Normally attached to endoplasmic reticulum
• Site of translation of mRNA into protein
• Each ribosome contains many enzymes for
protein formation
tRNA
• Transfer RNA
• Each molecule of tRNA has only one
triplet of bases exposed (anticodon)
• Each tRNA molecule picks up
appropriate amino acid from cytoplasm
at site of attachment
Translation
Let´s act it out!!
Now fill in the Translation worksheet
and review in your booklet
STARTER: Can you narrate this
overview?
Now finish your booklets!