There are three main types of RNA molecules that are synthesised inside the cell:
1. rRNA: rRNA is the ribosomal RNA. These RNA molecules make up the ribosome of the cell.
2. tRNA: tRNA also known as the transfer RNA (previously as sRNA for soluble RNA) is the adaptor RNA that helps in the synthesis of proteins in the ribosomal complex.
3. mRNA: mRNA is short for messenger RNA. The gene present on the DNA is transcribed to form an mRNA molecule. This mRNA molecule holds the code for the amino acids present in the protein.
Hence mRNA carries the protein coding information to the ribosome.