<prompt> What is present on the 3 end of all functional, mature tRNAs?The cloverleaf loopThe anticodonThe sequence 5CCA3The codon  <response>: 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. 