Which is the largest

Options

A. tRNA
B. rRNA
C. mRNA
D. Both B and C.

Answer

To determine which type of RNA is the largest among tRNA, rRNA, and mRNA, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Types of RNA**:
- The three types of RNA mentioned are:
- tRNA (transfer RNA)
- rRNA (ribosomal RNA)
- mRNA (messenger RNA)

2. **Understand the Functions of Each RNA**:
- **tRNA**: Transfers amino acids to the ribosome during protein synthesis. It is relatively small in size.
- **rRNA**: Forms the core of the ribosome's structure and catalyzes protein synthesis. It is larger than tRNA but smaller than mRNA.
- **mRNA**: Carries the genetic information from DNA to the ribosome for protein synthesis. It is the largest among the three.

3. **Compare the Sizes**:
- tRNA is the smallest RNA molecule.
- rRNA is larger than tRNA but smaller than mRNA.
- mRNA is the largest RNA molecule as it contains the complete nucleotide sequence necessary for protein synthesis.

4. **Conclusion**:
- Based on the size comparison, the largest RNA is **mRNA (messenger RNA)**.

### Final Answer:
The largest RNA is **mRNA (messenger RNA)**.

---