Which statement is true about RNA and genes?

Which statement is true about RNA and genes?

• A. Only a single type of RNA is encoded by genes.
• B. RNA is not encoded by genes.
• C. Three major RNA types (mRNA, tRNA, rRNA) are each encoded by their own genes.
• D. RNA is produced by protein-coding genes.

Answer: (C)

RNA comes from genes in the genome, and several distinct RNA species are built this way. The three major types used in biology—messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA)—each have their own sets of genes to be transcribed. mRNA carries the information from DNA to the ribosome and is the transcript that, for protein-coding genes, serves as the template for protein synthesis. tRNA and rRNA are functional RNAs that are not translated into proteins; they are produced from dedicated RNA genes. Because these RNA genes exist independently of protein-coding genes, the statement that each of the three major RNA types is encoded by its own genes is accurate. The other options don’t fit because there are multiple RNA types encoded by genes, RNA is indeed encoded by genes, and not all RNA comes from protein-coding genes (rRNA and tRNA come from RNA genes, while mRNA from protein-coding genes is just one aspect).

RNA comes from genes in the genome, and several distinct RNA species are built this way. The three major types used in biology—messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA)—each have their own sets of genes to be transcribed. mRNA carries the information from DNA to the ribosome and is the transcript that, for protein-coding genes, serves as the template for protein synthesis. tRNA and rRNA are functional RNAs that are not translated into proteins; they are produced from dedicated RNA genes. Because these RNA genes exist independently of protein-coding genes, the statement that each of the three major RNA types is encoded by its own genes is accurate. The other options don’t fit because there are multiple RNA types encoded by genes, RNA is indeed encoded by genes, and not all RNA comes from protein-coding genes (rRNA and tRNA come from RNA genes, while mRNA from protein-coding genes is just one aspect).