What is present on the 3' end of all functional, mature tRNAs?: (A) The cloverleaf loop, (B) The anticodon, (C) The sequence 5'CCA3', (D) The codon
Answer is C. 5' end of the tRNA is always base paired, and 3' end is free or attached to an amino acid. 3' end of all the tRNA ends with the same sequence, i.e. CCA. This trinucleotide sequence is post-transcriptionally added to the tRNA by the enzyme CCA tRNA nucleotidyl transferase.