Which of the following is not a salient features of the Double-helix structure of DNA

Options

A. (1) if the sequence of bases in one strand is known then the sequence in other strand can be predicted
B. The base pairing confers a very unique property to the polynucleotide chains
C. The proposition of base pairing between the two strands of polynucleotide chains was based on the observation of Maurice Wikins and Rosalind Franklin
D. if each strand from a DNA acts as template for synthesis of a new strand, the two double stranded DNA thus, produced would be identical to the parental DNA molecule.

Answer

To solve the question, "Which of the following is not a salient feature of the Double-helix structure of DNA?", we will analyze each of the provided statements to determine which one does not accurately describe a characteristic of DNA's double-helix structure.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a feature that is NOT characteristic of the double-helix structure of DNA. This means we need to identify the incorrect statement among the options given.

2. **Analyze Each Statement**:
- **Statement 1**: "If the sequence of bases in one strand is known, then the sequence in another strand can be predicted."
- **Analysis**: This is true. The base pairing rules (A with T and G with C) allow us to predict the complementary strand if one strand's sequence is known.

- **Statement 2**: "The base pairing confers a very unique property to the polynucleotide chains."
- **Analysis**: This is also true. Base pairing is a fundamental property of DNA that contributes to its stability and function.

- **Statement 3**: "The proposition of base pairing between the two strands of polynucleotide chain was based on the observation of Mollis-Wilkins and Rosalind-Franklin."
- **Analysis**: This statement is misleading. While Rosalind Franklin's X-ray diffraction images contributed to the understanding of DNA's structure, the concept of base pairing was primarily elucidated by Watson and Crick. Therefore, this statement is incorrect regarding the attribution of the discovery.

- **Statement 4**: "If each strand from a DNA acts as a template."
- **Analysis**: This is true. Each strand of DNA serves as a template during replication, allowing for the formation of identical daughter strands.

3. **Identify the Incorrect Statement**: Based on the analysis, Statement 3 is the only one that does not accurately reflect a salient feature of the double-helix structure of DNA.

4. **Conclusion**: The answer to the question is Statement 3.

### Final Answer:
The statement that is not a salient feature of the double-helix structure of DNA is **Statement 3**.

---