Where is RNA commonly found?

Where is RNA commonly found?

• A. In cytoplasm
• B. In mitochondria
• C. In nucleus
• D. In plasma membrane

Answer: (A)

RNA is the intermediary and machinery for making proteins, so its location reflects where translation happens. In cells, especially in eukaryotes, the genetic message is transcribed in the nucleus but then exported to the cytoplasm, where ribosomes translate mRNA into proteins. The cytoplasm contains the bulk of active RNA—messenger RNA, transfer RNA, and ribosomal RNA bound to ribosomes—making it the most common site for RNA’s functional presence. While RNA is also found in mitochondria (and, in bacteria, within the cytoplasm as transcription and translation occur there), the total amount in the cytoplasm typically far exceeds RNA in organelles. The plasma membrane, by contrast, is not a site where RNA resides.

RNA is the intermediary and machinery for making proteins, so its location reflects where translation happens. In cells, especially in eukaryotes, the genetic message is transcribed in the nucleus but then exported to the cytoplasm, where ribosomes translate mRNA into proteins. The cytoplasm contains the bulk of active RNA—messenger RNA, transfer RNA, and ribosomal RNA bound to ribosomes—making it the most common site for RNA’s functional presence. While RNA is also found in mitochondria (and, in bacteria, within the cytoplasm as transcription and translation occur there), the total amount in the cytoplasm typically far exceeds RNA in organelles. The plasma membrane, by contrast, is not a site where RNA resides.