Post-transcriptional or primary transcript processing doesn't involve one of these. Identify which is the odd one out:

Options

A. hnRNA tailoring
B. tRNA silencing
C. Capping
D. Polyadenylation

Explanation

To solve the question regarding which component does not participate in post-transcriptional or primary transcript processing, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Post-Transcriptional Processing**:
- Post-transcriptional processing refers to the modifications that the primary RNA transcript (hnRNA) undergoes after transcription and before it becomes mature mRNA. This includes processes like capping, polyadenylation, and splicing.

2. **Identifying Key Components**:
- The primary transcript (hnRNA) is modified by adding a 5' cap and a 3' poly-A tail. Additionally, introns (non-coding regions) are removed through splicing, and exons (coding regions) are joined together.

3. **Listing Common Components Involved**:
- Common components involved in post-transcriptional processing include:
- **Capping**: Addition of a modified guanine nucleotide at the 5' end.
- **Polyadenylation**: Addition of a poly-A tail at the 3' end.
- **Splicing**: Removal of introns and joining of exons.

4. **Identifying the Odd One Out**:
- The question asks for the component that does not participate in this process. The components typically involved in post-transcriptional processing are hnRNA, capping, polyadenylation, and splicing.
- **tRNA (transfer RNA)** is not involved in the processing of the primary transcript into mature mRNA. Instead, tRNA is involved in the translation process, where it helps in the synthesis of proteins by bringing amino acids to the ribosome.

5. **Conclusion**:
- Therefore, the odd one out that does not participate in post-transcriptional processing is **tRNA**.

### Final Answer:
The odd one out is **tRNA**.