Question

Which type of RNA molecules make up more than 80% of the total RNA in the cell?

• A. rRNA
• B. mRNA
• C. tRNA
• D. SnRNA

Hint:

RNA abundance:
- rRNA > tRNA > mRNA > SnRNA.
- rRNA makes up about 80-85% of total cellular RNA.
- mRNA is the least abundant type of RNA.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
This question tests knowledge of the relative abundance of different RNA types in cells.

Step 2: Detailed Explanation:
In a typical cell:
- rRNA (Ribosomal RNA): Makes up about 80-85% of total cellular RNA.
- tRNA: Makes up about 10-15% of total RNA.
- mRNA: Makes up about 3-5% of total RNA.
- SnRNA (Small nuclear RNA): Makes up a very small fraction (<1%).
The large proportion of rRNA reflects the high number of ribosomes needed for protein synthesis.
Thus, rRNA is the most abundant RNA type in cells.

Step 3: Final Answer:
Thus, rRNA makes up more than 80% of the total RNA in the cell, which corresponds to option (A).
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