how does a tRNA get its amino acid or charge up?

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In protein synthesis; translation

Dec 1st, 2014

The correct amino acid is added to its tRNA by a specific enzyme called an aminoacyl-tRNA synthetase. The process is called aminoacylation, or charging. 

Since there are 20 amino acids, there are 20 aminoacyl-tRNA synthetases. 

All tRNAs with the same amino acid are charged by the same enzyme, even though the tRNA sequences, including anticodons, differ.

http://www.phschool.com/science/biology_place/biocoach/translation/addaa.html

Dec 1st, 2014

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