Which of the following RNA has structural and catalytic role in translation ?

Options

A. m-RNA
B. t-RNA
C. r-RNA
D. g-RNA

Answer

To answer the question "Which of the following RNA has structural and catalytic role in translation?", we can follow these steps:

### Step 1: Understand the Types of RNA
There are several types of RNA involved in the process of translation:
- **mRNA (messenger RNA)**: Serves as a template for protein synthesis.
- **tRNA (transfer RNA)**: Transfers amino acids to the growing polypeptide chain.
- **rRNA (ribosomal RNA)**: Forms the core of the ribosome's structure and has a catalytic role.
- **gRNA (guide RNA)**: Involved in genome editing, not directly related to translation.

### Step 2: Identify the Role of Each RNA
- **mRNA**: It carries the genetic information from DNA to the ribosome, where proteins are synthesized.
- **tRNA**: It brings the appropriate amino acids to the ribosome during translation.
- **rRNA**: It not only provides structural support to the ribosome but also has catalytic functions, facilitating the formation of peptide bonds between amino acids.
- **gRNA**: It is not involved in translation but is important in processes like CRISPR for genome editing.

### Step 3: Focus on rRNA
From the analysis, we see that rRNA is unique because it fulfills both structural and catalytic roles in the translation process. It forms the ribosome's structure and acts as a ribozyme, which catalyzes the formation of peptide bonds.

### Step 4: Conclusion
Based on the above understanding, the correct answer to the question is that **rRNA (ribosomal RNA)** has both a structural and catalytic role in translation.

### Final Answer
The RNA that has structural and catalytic roles in translation is **rRNA (ribosomal RNA)**.

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