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D. More than 20, less than 61.To achieve fidelity of translation there must be a recognizably different t-RNA for each amino acid, giving a minimum number of 20. However most amino acids are coded by more than one codon and a different t-RNA could exist for each codon, giving 61 if each codon specifying an amino acid has a different t-RNA,or 64 if the three stop message codons also have t-RNAs.
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