Why does hnRNA to undergo splicing ? Where does splicing occur in the cell ?

Explanation

### Step-by-Step Solution:

1. **Definition of hnRNA**: hnRNA stands for heterogeneous nuclear RNA. It is the primary transcript that is synthesized from DNA during the process of transcription.

2. **Composition of hnRNA**: hnRNA consists of both introns and exons.
- **Introns**: These are non-coding regions of RNA that do not contribute to the final protein product.
- **Exons**: These are coding regions that contain the information necessary to produce proteins.

...