Saturday, February 6, 2010

How does the genetic code control the joining together of amino acids?

its 4 ma science h/w!How does the genetic code control the joining together of amino acids?
It doesn't directly code the joining of the amino acids - but it *does* code the order the amino acids will occur in.





The nucleotides in your DNA are grouped into threes: each three nucleotides is an ';anticodon'; (like CAG, or TTA).


This anticodon is ';translated'; into a codon in your mRNA (so CAG becomes GUC, and TTA becomes AAU).


These anticodons are ';read'; by the ribosomes and by codons on your tRNA (so GUC pairs with a tRNA with CAG, and AAU with a tRNA with UUT).


Each tRNA carries one specific amino acid (a CAG tRNA will carry a Valine, and a UUT tRNA carries an Asparagine), and these are linked together in order in the ribosome.





So if the gene in your DNA reads CAGTTAGGGATA.


The mRNA transcript will read GUCAAUCCCUAU


And the final amino acid sequence will be Val-Asn-Pro-TyrHow does the genetic code control the joining together of amino acids?
The arrangement of nucleotides in your DNA determines what order your amino acids are placed in a protein chain.


Adenine goes with Thymine


Guanine goes with Cytosine

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