DNA is a chain of nucleotides. Messenger RNAs (mRNAs) specify the amino acid sequence of one or more polypeptides and base triplets represent codons. Transfer RNAs (tRNAs) read the genetic information present in the form of triplets in the mRNA and transfer the appropriate amino acid from amino acid pool of cytoplasm to a growing polypeptide chain during protein synthesis. All tRNAs have about 73 to 93 nucleotides that fold into four base-paired stems and three loops. The anticodon loop has triplet at the tip which base pairs with the corresponding codon in mRNA. Ribosomal RNAs (rRNAs) are structural constituents of ribosomes that provide the site for proteins synthesis which makes them the most abundant form of RNA. snRNA are part of splicing of hnRNA.