Select the statement that is correctly relatable with DNA.

Options

A. Double helical structure in which two strands of polynucleotide runs parallel to each other.
B. The chief bond to hold the monomeric units together is the H- bonds.
C. N- bases projected more or less perpendicular to back bone and faces inside.
D. DNA is a homopolymer of nucleosides.

Answer

To solve the question "Select the statement that is correctly relatable with DNA," we will analyze each option provided and determine which statement is accurate.

### Step-by-Step Solution:

1. **Analyze the First Statement**:
- The first statement claims that DNA is a double helical structure in which two strands of polynucleotide run parallel to each other.
- **Evaluation**: This statement is incorrect. DNA strands are not parallel; they are anti-parallel. One strand runs in the 5' to 3' direction, while the other runs in the 3' to 5' direction.

2. **Analyze the Second Statement**:
- The second statement suggests that the chief bond holding the monomeric units together is the hydrogen bonds.
- **Evaluation**: This statement is also incorrect. While hydrogen bonds do hold the nitrogenous bases together, the backbone of the DNA is held together by phosphodiester bonds. Therefore, both types of bonds are important, making this statement false.

3. **Analyze the Third Statement**:
- The third statement states that nitrogenous bases are projected more or less perpendicular to the backbone and face inside.
- **Evaluation**: This statement is correct. In the DNA structure, the nitrogenous bases do project perpendicularly to the sugar-phosphate backbone, forming the rungs of the helical ladder.

4. **Analyze the Fourth Statement**:
- The fourth statement claims that DNA is a homopolymer of nucleosides.
- **Evaluation**: This statement is incorrect. DNA is a homopolymer of nucleotides, not nucleosides. Nucleotides consist of a nitrogenous base, a sugar, and a phosphate group.

### Conclusion:
The only correct statement relating to DNA is that the nitrogenous bases are projected more or less perpendicular to the backbone and face inside.

### Final Answer:
The correct statement is: "Nitrogenous bases projected more or less perpendicular to the backbone and face inside."

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