Which of the following types of RNA makeup the largest proportion of total cellular RNA?
Correct answer: B. Ribosomal RNA
- A. Messenger RNA
- B. Ribosomal RNA
- C. Transfer RNA
- D. Catalytic RNA (ribozyme)
Explanation
Ribosomal RNA accounts for roughly 80 per cent of the RNA in a cell, because every ribosome is built largely from it and a busy cell contains millions of ribosomes. Transfer RNA comes next at around 15 per cent, and messenger RNA is a small and rapidly turning over fraction. Ribozymes are rarer still.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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About Ribonucleic Acid (RNA)
Ribonucleic acid is generally a single-stranded nucleic acid containing ribose and uracil instead of thymine. Coverage includes mRNA, tRNA and rRNA, complementary base pairing, transcription and translation, and the differences between RNA and DNA in structure, location and biological function.
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