Which of the following is involved in translation :-

Options

A. DNA
B. mRNA, tRNA, DNA
C. mRNA, tRNA
D. Only mRNA

Answer

To solve the question "Which of the following is involved in translation?", we will analyze the options provided and understand the role of each component in the process of translation.

### Step-by-Step Solution:

1. **Understanding Translation**:
- Translation is the process of protein synthesis where the information encoded in mRNA is used to assemble amino acids into a polypeptide chain, ultimately forming proteins.

2. **Identifying the Components**:
- The options provided are:
- A) DNA
- B) mRNA
- C) tRNA
- D) Only mRNA

3. **Role of DNA**:
- DNA is not directly involved in translation. It serves as the template for transcription, where mRNA is synthesized. Therefore, DNA is not a participant in the translation process.

4. **Role of mRNA**:
- mRNA (messenger RNA) is crucial for translation as it carries the genetic information from DNA to the ribosome, where protein synthesis occurs. It serves as the template for assembling amino acids in the correct order.

5. **Role of tRNA**:
- tRNA (transfer RNA) is also essential in translation. It brings the appropriate amino acids to the ribosome, matching them to the codons on the mRNA through its anticodon. This ensures that the correct amino acids are added to the growing polypeptide chain.

6. **Conclusion**:
- Since both mRNA and tRNA are involved in the translation process, the correct answer must include both of these components. The option "only mRNA" is incorrect because tRNA is also necessary for translation.

### Final Answer:
The correct answer is that both **mRNA and tRNA** are involved in translation.