In both prokaryotes and eukaryotes, there are three main types of RNA – messenger RNA or mRNA, ribosomal or rRNA, and transfer RNA or tRNA.
mRNA - It carries the genetic code copied from the DNA during transcription in the form of triplets of nucleotides called codons.
rRNAs are found in the ribosomes and account for 80% of the total RNA present in the cell.
tRNAs also act as adapters in the translation of the genetic sequence of mRNA into proteins. Therefore they are also called adapter molecules.
