Final answer:
The types of RNA that play vital roles in cellular metabolism primarily serve the function of protein synthesis.
Step-by-step explanation:
The types of RNA that play vital roles in cellular metabolism primarily serve the function of protein synthesis.
Messenger RNA (mRNA) copies the genetic instructions from DNA and carries them to the cytoplasm for protein synthesis. Ribosomal RNA (rRNA) helps form ribosomes, which are the organelles where proteins are assembled. Transfer RNA (tRNA) brings amino acids to the ribosomes, where they are joined together to form proteins.