Question:
In plant cell, which of the following organelle produces 70–90% of cellular RNA?
In plant cell, which of the following organelle produces 70–90% of cellular RNA?
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The nucleolus synthesizes ribosomal RNA (rRNA), which accounts for $80\text{--}90\%$ of all cellular RNA in the cell.
Updated On: Sep 15, 2026
- Plastid
- Nucleolus
- Mitochondria
- Endoplasmic reticulum
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Total cellular RNA comprises ribosomal RNA (rRNA, $80\text{--}90\%$), transfer RNA (tRNA, $10\text{--}15\%$), and messenger RNA (mRNA, $1\text{--}5\%$).
Step 2: Detailed Explanation:
The nucleolus is the dense sub-nuclear organelle housing ribosomal DNA (rDNA) tandem repeats.
It is the active transcription site where RNA Polymerase I transcribes the 45S pre-rRNA precursor (processing into 28S, 18S, and 5.8S rRNAs), accounting for 70% to 90% of total steady-state cellular RNA biomass.
Step 3: Final Answer:
Therefore, the nucleolus produces 70–90% of cellular RNA.
Total cellular RNA comprises ribosomal RNA (rRNA, $80\text{--}90\%$), transfer RNA (tRNA, $10\text{--}15\%$), and messenger RNA (mRNA, $1\text{--}5\%$).
Step 2: Detailed Explanation:
The nucleolus is the dense sub-nuclear organelle housing ribosomal DNA (rDNA) tandem repeats.
It is the active transcription site where RNA Polymerase I transcribes the 45S pre-rRNA precursor (processing into 28S, 18S, and 5.8S rRNAs), accounting for 70% to 90% of total steady-state cellular RNA biomass.
Step 3: Final Answer:
Therefore, the nucleolus produces 70–90% of cellular RNA.
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