Aminoacyl-tRNA synthase

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 There are 20 free floating amino acids in the cytosol of a cell, therefore making it difficult for tRNA molecules to find and attach to the relevant amino acids that are specific to their anti codon. Having the correct amino acid attached to the right tRNA molecule is crucial during translation to avoid mutations to the resultant portein. This is why the cell is reliant upon the 20 different Aminoacyl-tRNA synthase enzymes which are all specifically adapted to binding one of the amino acids to their matching tRNA. So as a result the CGC codon in a mRNA molecule will always bind to a tRNA with an anticodon of GCG and an amino acid of Alanine will be added to the ever growing protein chain.    

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