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Cloverleaf t-RNA structure has, at the 3'-acceptor end, the universal sequence:
AAUG
BCCA
CUAC
DAAUAAA
Answer & Solution
Correct answer: B. CCA
Every tRNA terminates with the 3'-CCA-OH sequence (unpaired), to which the cognate amino acid attaches via aminoacyl-tRNA synthetase. The anticodon loop (opposite end) recognises mRNA codon.
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