Discussion
The t-RNA is specific for an amino acid and it differs in sequence of nucleotides. All t-RNA molecules contain a base paired stem that terminates in the CCA sequence at :
Answer: A
The CCA sequence lies at the 3' termini of tRNAs.
Every tRNA has an acceptor stem in which the 5' and 3' ends pair, and the 3' strand runs on as a single-stranded CCA tail. The amino acid is attached by aminoacyl-tRNA synthetase to the 2' or 3' hydroxyl of the terminal adenosine, so this end carries the amino acid into the ribosome.
The 5' end is the other strand of the acceptor stem and has no CCA. The anticodon arm is at the opposite end of the molecule and carries the anticodon that reads the mRNA. 'Spacer arm' is not a part of tRNA structure; the variable arm lies between the anticodon and T arms.
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