Question

What is the role of RNA

Answer 1

There are 3 roles of RNA in protein synthesis
1) Messenger RNA or abbreviated as mRNA 
 - Carries genetic material copied from DNA in the form of series of 3 base coded "words"
- Each word represents an amino acid which will be  built into a protein later
2)Transfer RNA of tRNA
 - The key to deciphering the mRNA
 - The correct tRNA will adhere to the mRNA in a ribosome with an amino acid in tow which will connect to form a polypeptide chain.
3) Ribosomal RNA or rRNA
 -The rRNA kind of facilitates protein synthesis 
 - It is what forms the protein from a polypeptide chain.
 - Also joins the ribosome together ( Ribosomes are made of 2 subunits)
The process is kind of a visual process. For me, I had to kind see it to actually understand. It is a confusing process to understand from just words.

Crash Course Biology on Youtube should have an episode on Protein Synthesis or on RNA and the nucleic acids
There are also various animations online that show the process.

hope this helps

Answer 2

I honestly don't remember much about this and I'm sure someone else will answer more thoroughly for you but I believe it is the "messenger". It carries instructions from DNA to conrol the synthesis of proteins