rRNA constitutes ____________% of the total cellular RNA?
Correct answer: C. 80%
- A. 3-4 %
- B. 10-20%
- C. 80%
- D. 90%
Explanation
Ribosomal RNA makes up about 80% of the total RNA in a typical cell because ribosomes contain a large amount of rRNA and cells have many ribosomes. Messenger RNA and transfer RNA form much smaller fractions. Students may choose 90% by overestimating the dominance of rRNA or confusing total cellular RNA with ribosomal RNA within a ribosome.
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