What are the three major classes of RNA, and what is the function of each?

The three major classes of RNA are: mRNA, which carries genetic information stored in DNA out of the nucleus to be coded into proteins at a ribosome; rRNA, teams up with proteins to create the active parts of ribosomes, which play a crucial role in helping build peptides. and tRNA, which are small clover-leaf shaped RNA units that translate mRNA code into amino acids during translation at the ribosome.