Which are the three types of RNA used in protein synthesis?

• A. miRNA, siRNA, and rRNA
• B. mRNA, tRNA and rRNA
• C. tRNA, rRNA and siRNA
• D. mRNA, tRNA and nsRNA

Answer: (B)

Proteins are built by translating genetic information with three RNA species that work together at the ribosome. Messenger RNA carries the genetic code from DNA to the ribosome, each codon specifying which amino acid should be added. Transfer RNA brings the correct amino acids to the growing chain and uses its anticodon to pair with the mRNA codons, guiding precise incorporation. Ribosomal RNA forms the ribosome itself and provides the catalytic activity that links amino acids together. Regulatory RNAs like microRNA or siRNA influence gene expression rather than participating directly in translation, and nsRNA isn’t a standard type involved in protein synthesis. So the trio that directly drives translation is mRNA, tRNA, and rRNA.