What Are The Different Types Of RNA? Please Explain Their Role And Translation.

I think they only listed the three primary forms of RNA...
The other ones are only mentioned when referring to specific cases.

First I would explain what RNA stands for. It is known as Ribonucleic Acid. There are different forms of RNA. Their names are listed below. Each of these types of RNA has a different role. Their names are as follows:

• Messenger RNA ( mRNA )
• Ribosomal RNA ( rRNA )
• Transfer RNA ( tRNA )

Now coming to the functions of these various types of RNA within the complex mechanism of translation RNA.

Messenger RNA- The message encoded in mRNA molecule is translated into primary sequence of polypeptide chain.
Ribosomal RNA- Ribosomes are small organelles where protein synthesis takes place in the cell. Ribosomal RNA makes up 80% of the RNA within the cell. And the larger molecule contains over 3500 nucleotides.
Transfer RNA- There are a group of small RNA molecules each one for a particular amino acid. Their role is to carry amino acids to ribosomes for protein synthesis. Each tRNA recognizes coding sequence for a particular amino acid in the Messenger RNA. Transfer RNA molecules are about 75 nucleotides long and represent up to 15% of the cellular RNA.

Amongst the above mentioned types of RNA the most significant of these is the intermediary molecule the Messenger RNA also known as Genetic Messenger.