are there three types of rna?
Types of RNA In both prokaryotes and eukaryotes, there are three main types of RNA â messenger RNA or mRNA, ribosomal or rRNA, and transfer RNA or tRNA. These 3 types of RNA are discussed below. Messenger RNA (mRNA) mRNA accounts for just 5% of the total RNA in the cell. mRNA is the most heterogeneous of the 3 types of RNA in terms of both base sequence and size. It carries the genetic code copied from the DNA during transcription in the form of triplets of nucleotides called codons. Each codon specifies a particular amino acid, but one amino acid can be coded by many different codons.