Which of the following types of RNA is the most abundant in the body?

Options

A. mRNA
B. rRNA
C. tRNA
D. sRNA

Answer

To determine which type of RNA is the most abundant in the body, we will analyze the three main types of RNA: mRNA, rRNA, and tRNA.

### Step-by-Step Solution:

1. **Identify the Types of RNA**:
- The three main types of RNA are:
- Messenger RNA (mRNA)
- Ribosomal RNA (rRNA)
- Transfer RNA (tRNA)

2. **Analyze mRNA**:
- mRNA is the longest type of RNA and carries genetic information from DNA to the ribosome for protein synthesis.
- It constitutes only about 2-5% of the total RNA in the cell.

3. **Analyze rRNA**:
- Ribosomal RNA (rRNA) is a major component of ribosomes, which are the sites of protein synthesis.
- It is the most abundant type of RNA, making up about 70-80% of the total RNA in the cell.
- It plays a crucial role in catalyzing the formation of peptide bonds during translation.

4. **Analyze tRNA**:
- Transfer RNA (tRNA) is responsible for bringing amino acids to the ribosome during protein synthesis.
- It is the smallest type of RNA and has many different types (hundreds), but it constitutes a smaller percentage of total RNA compared to rRNA.

5. **Conclusion**:
- Based on the analysis, ribosomal RNA (rRNA) is the most abundant type of RNA in the body, accounting for 70-80% of the total RNA.

### Final Answer:
The most abundant type of RNA in the body is **ribosomal RNA (rRNA)**.