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With regard to mature mRNA in eukaryotes...

With regard to mature mRNA in eukaryotes

A

exons and introns do not appear in the mature RNA

B

exons appear but introns do not apper in the mature RNA

C

introns appear but exons do not apper in the mature RNA

D

both exons. And introns appear in the mature RNA

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding mRNA in Eukaryotes**: In eukaryotic cells, the initial RNA transcript produced from DNA is called pre-mRNA. This pre-mRNA contains both coding and non-coding regions. 2. **Identifying Exons and Introns**: The coding regions of the gene are known as exons, while the non-coding regions that interrupt these coding sequences are called introns. 3. **Splicing Process**: Before the pre-mRNA can be translated into a protein, it undergoes a process called splicing. During splicing, introns are removed from the pre-mRNA, and the exons are joined together. 4. **Formation of Mature mRNA**: The final product after splicing is known as mature mRNA. This mature mRNA consists only of exons, as all introns have been removed. 5. **Conclusion**: Therefore, in mature mRNA of eukaryotes, exons are present while introns are absent. 6. **Final Answer**: The correct statement regarding mature mRNA in eukaryotes is: "Exons appear but introns do not appear in the mature RNA."
### Step-by-Step Solution: 1. **Understanding mRNA in Eukaryotes**: In eukaryotic cells, the initial RNA transcript produced from DNA is called pre-mRNA. This pre-mRNA contains both coding and non-coding regions. 2. **Identifying Exons and Introns**: The coding regions of the gene are known as exons, while the non-coding regions that interrupt these coding sequences are called introns. 3. **Splicing Process**: Before the pre-mRNA can be translated into a protein, it undergoes a process called splicing. During splicing, introns are removed from the pre-mRNA, and the exons are joined together. ...
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