What are the different types of RNA found in the cells of organisms? What are their functions?

RNA molecules are of three types and they perform different functions. They are named as messenger
RNA (m-RNA), ribosomal RNA (r-RNA) and transfer RNA (t-RNA).

messenger RNA (m-RNA):
It carries the message, genetic information from DNA to the ribosomes where protein synthesis takes places. It reads the message in the group of three bases. The triplet of bases is called condon. m-RNA is a short -lived molecule.

Transfer RNA (t-RNA):
It acts as a carrier of amino acids. The t-RNA reads the codons expressed in m-RNA on the ribosomal particle. Each triplet of t-RNA thus carries the specific amino acid and transfers it to the proper location on the ribosomal particle. All t-RNA molecules have an L-shaped tertiary structure. The hydrophobic interaction is a major stabilising force in the tertiary structure of t-RNA.
Ribosomal RNA (r-RNA)
Ribosomal RNA (r-RNA) is an integral part of ribosomes that carries the genetic information from DNA to the ribosomes where actually the protein synthesis takes place.