Question:
Primary role of post-transcriptional modifications such as 5'capping and 3'poly(A) tailing of mRNA is
Primary role of post-transcriptional modifications such as 5'capping and 3'poly(A) tailing of mRNA is
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5' cap:
- Protects from 5' exonuclease.
- 3' poly(A) tail: Protects from 3' exonuclease.
- Both enhance mRNA stability and translation efficiency.
- Protects from 5' exonuclease.
- 3' poly(A) tail: Protects from 3' exonuclease.
- Both enhance mRNA stability and translation efficiency.
Updated On: Sep 1, 2026
- Precision of translation
- Stability
- Transport to cytoplasm
- Relative expression of the gene
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
This question tests knowledge of mRNA processing.
Step 2: Detailed Explanation:
The primary roles of 5' capping and 3' poly(A) tailing are:
- Stability (B): Protect mRNA from degradation by exonucleases.
- Transport to cytoplasm (C): Also a function, but stability is primary.
- Precision of translation (A): Not a direct role.
- Relative expression (D): Not a direct role.
Both modifications contribute to mRNA stability by protecting the ends.
Thus, the primary role is stability.
Step 3: Final Answer:
Thus, the primary role is stability, which corresponds to option (B).
[0.5cm]
This question tests knowledge of mRNA processing.
Step 2: Detailed Explanation:
The primary roles of 5' capping and 3' poly(A) tailing are:
- Stability (B): Protect mRNA from degradation by exonucleases.
- Transport to cytoplasm (C): Also a function, but stability is primary.
- Precision of translation (A): Not a direct role.
- Relative expression (D): Not a direct role.
Both modifications contribute to mRNA stability by protecting the ends.
Thus, the primary role is stability.
Step 3: Final Answer:
Thus, the primary role is stability, which corresponds to option (B).
[0.5cm]
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