The coding segment of DNA is :

Options

A. Exon
B. Replicon
C. Intron
D. Muton

Answer

### Step-by-Step Text Solution:

1. **Understanding DNA Coding Segments**:
- DNA contains segments that are responsible for coding proteins. These segments are known as exons.

2. **Differentiating Between Exons and Introns**:
- Within the DNA, there are two types of sequences: exons and introns.
- Exons are the coding sequences that contain the information necessary for protein synthesis, while introns are non-coding sequences that do not contribute to the final protein product.

3. **Transcription Process**:
- During transcription, the DNA is transcribed into messenger RNA (mRNA). Initially, this mRNA is immature and contains both exons and introns.

4. **Maturation of mRNA**:
- The immature mRNA undergoes a process where introns are removed, and exons are spliced together. This process is essential for producing mature mRNA.

5. **Function of Mature mRNA**:
- The mature mRNA, which consists only of exons, is then capable of being translated into proteins. This is because it contains the necessary codons that specify the amino acids in the protein sequence.

6. **Conclusion**:
- Therefore, the coding segments of DNA are the exons, as they are responsible for coding the functional codons that lead to protein synthesis.