<prompt> Anti-codon arm is seen inm-RNAr-RNAt-RNAsn- RNA  <response>: Ans. c t-RNA There are three main types of RNA: tRNA, mRNA, and rRNA. The most abundant form of RNA is rRNA or ribosomal RNA because it is responsible for coding and producing all the proteins in cells. tRNA transfer RNA: RNA which transfers amino acid from cytoplasm to ribosomal protein synthesizing machinery. Secondary structure: Clover leaf shape Tertiary structure: L shapedtRNA Arms Acceptor arm: It is 3 end of tRNA, and has 3 unpaired nucleotide, CCA It is the site of amino acid attachment Anticodon arm: It has trinucleotide sequence complimentary to the codon of the amino acid, which mRNA carries. Codon of mRNA and anti-codon of tRNA are antiparallel in their complimentary. DHU armD-arm: Recognizes the specific amino acyl tRNA synthetase enzyme Pseudo uridine arm: Binds the charged tRNA to the ribosome Variable armExtra arm: Most variable feature of tRNA. It differentiates the different class of tRNA. 