Which form of RNA has a structure is said to be inverted L model?

Options

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

Explanation

To answer the question "Which form of RNA has a structure that is said to be an inverted L model?", we can follow these steps:

### Step-by-Step Solution:

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

2. **Understand the Functions of Each RNA Type**:
- **mRNA**: Carries genetic information from DNA to the ribosome for protein synthesis.
- **tRNA**: Transfers amino acids to the ribosome during protein synthesis and helps decode the mRNA.
- **rRNA**: Forms the core of the ribosome's structure and catalyzes protein synthesis.

3. **Focus on the tRNA Structure**:
The question specifically asks about the "inverted L model." This model is associated with the structure of tRNA.

4. **Describe the Inverted L Model**:
The tRNA molecule has a unique cloverleaf structure that can be visualized as an inverted L. This structure is formed by the folding of a long chain of nucleotides into loops and stems. The key components include:
- **D-loop**: One of the loops in the tRNA structure.
- **Anticodon loop**: Contains the anticodon that pairs with the mRNA codon.
- **T-loop**: Another loop that is part of the tRNA structure.
- **Stems**: Formed by paired regions of nucleotides.

5. **Conclusion**:
The tRNA is the type of RNA that has a structure known as the inverted L model. Therefore, the correct answer to the question is **tRNA**.

### Final Answer:
The form of RNA that has a structure said to be an inverted L model is **tRNA** (transfer RNA).

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