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In eukaryotes, after transcription of mR...

In eukaryotes, after transcription of mRNA, some of its nucleotides are removed before it is translated into a polypeptide. The nucleotides which are removed from mRNA are called :

A

Exons

B

Upstream sequences

C

Unusual bases

D

Introns

Text Solution

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The correct Answer is:
To solve the question regarding the removal of nucleotides from mRNA in eukaryotes after transcription, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Process of Transcription**: - In eukaryotes, transcription occurs in the nucleus where DNA is used to synthesize a precursor mRNA (also known as heteronuclear RNA or hnRNA). 2. **Identify Post-Transcriptional Modifications**: - After transcription, the hnRNA undergoes several modifications before it becomes mature mRNA. These modifications include capping, polyadenylation, and splicing. 3. **Focus on Splicing**: - During splicing, certain sequences within the hnRNA are removed. These sequences that are removed are known as introns. The remaining sequences, which are coding regions, are called exons. 4. **Define Introns and Exons**: - **Introns**: Non-coding sequences that are removed from the mRNA during the splicing process. - **Exons**: Coding sequences that remain in the mRNA and are translated into a polypeptide. 5. **Conclusion**: - The question specifically asks for the nucleotides that are removed from mRNA, which corresponds to the introns. ### Final Answer: The nucleotides which are removed from mRNA are called **introns**. ---
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