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Translation
Section 11-2 cont.
Transcription
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20 different amino acids
A group of three nucleotides in mRNA code for
one amino acid. This is called a codon.
AUG – start codon
UAA – Stop codon
Converts mRNA to Protein
Occurs at the ribosome in the cytoplasm
1. When the strands of mRNA arrive in the
cytoplasm, ribosomes attach to them.
2. Each tRNA molecule attaches to only one type
of amino acid. The tRNA brings the amino acid
to the ribosome.
3. On the opposite side of the tRNA molecule
from the amino acid site, there is a sequence of
3 nucleotides that are complement of the
nucleotides in the codon.
4. First codon is AUG
(the start codon).
The ribosome then
slides along the
mRNA to the next
codon.
5. A new tRNA
molecule carrying an
amino acid pairs with
the second mRNA
codon.
6. The first and second amino acid are jointed
together by a peptide bond.
7. The process continues, forming a chain of
amino acids until the ribosome reach a stop
codon.
Translation