Which type of RNA accounts for the largest fraction (approximately 80%) of total cellular RNA in a typical eukaryotic cell?
Answer and explanation
Correct answer: A. Ribosomal RNA (rRNA)
- Step 1: Ribosomes are abundant macromolecular complexes essential for all protein synthesis. Step 2. Ribosomal RNA (rRNA) constitutes roughly 80-85% of total RNA, tRNA constitutes ~10-15%, and mRNA constitutes only 1-5%. Answer: Ribosomal RNA (rRNA). Why not the others: mRNA is short-lived and accounts for ~1-5%; tRNA accounts for ~10-15%; snRNA accounts for <1%.
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