1. Messenger RNA (mRNA): This is the RNA molecule that carries the genetic information from DNA in the nucleus to the ribosomes in the cytoplasm, where protein synthesis takes place.

2. Transfer RNA (tRNA): This RNA molecule acts as a "translator" during protein synthesis. It carries specific amino acids to the ribosomes, matching them to the codons on the mRNA to build the protein chain.

3. Ribosomal RNA (rRNA): This RNA molecule is a major component of ribosomes, the cellular machinery responsible for protein synthesis. rRNA provides the structural framework for ribosomes and participates in the catalytic steps of protein synthesis.

Let me know if you'd like to learn more about any of these types of RNA!