Eukaryotic Transcription

Step 1: In eukaryotic transcription, the RNA produced is initially a heterogeneous nuclear RNA (hnRNA) that includes both introns and exons.
- Exons are the regions that code for the protein.
- Introns are the non-coding regions that are spliced out during the processing of hnRNA to mRNA.
Step 2: Examining the given sequence of hnRNA:
- The diagram shows a sequence where the exons are represented as coding regions (usually shown with larger segments).
- The introns are the non-coding regions that interrupt the exons.
Step 3: Counting the introns and exons:
- From the given sequence, there are 8 exons and 7 introns in the hnRNA.
Step 4: Conclusion:
The correct number of introns and exons are 8 and 7, respectively. Hence, the correct answer is option (B).