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In tailing, about adenylate residues ar...

In tailing, about ____________ adenylate residues are added at ` 3' ` -end in a template independent manner on hnRNA

A

`1000-2000`

B

`10 - 15`

C

`200-300`

D

`3000-3500`

Text Solution

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The correct Answer is:
To solve the question regarding the number of adenylate residues added at the 3' end of hnRNA during the tailing process, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding hnRNA**: - Heterogeneous nuclear RNA (hnRNA) is the primary transcript that is synthesized from DNA during transcription. It undergoes several processing steps before becoming mature mRNA. 2. **Post-Transcriptional Modifications**: - After the synthesis of hnRNA, it undergoes several modifications, including splicing, capping, and tailing. Tailing specifically refers to the addition of adenylate residues at the 3' end. 3. **Tailing Process**: - During the tailing process, a chain of adenylate residues (poly-A tail) is added to the 3' end of the hnRNA. This addition occurs in a template-independent manner, meaning it does not require a DNA template. 4. **Number of Adenylate Residues**: - The typical length of the poly-A tail added to the hnRNA is approximately 200 to 300 adenylate residues. This is a standard range observed in eukaryotic cells. 5. **Final Answer**: - Therefore, the answer to the question is that in tailing, about **200 to 300** adenylate residues are added at the 3' end of hnRNA. ### Conclusion: The correct answer is **200 to 300** adenylate residues. ---
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