The plane of one base pair stacks over the other in double helix. This provides

Options

A. Antiparallel nature to DNA double helix
B. Uniform length in all DNA
C. Uniform width throughout DNA
D. Additional stability to DNA

Explanation

To solve the question "The plane of one base pair stacks over the other in double helix. This provides," we need to analyze the structure of DNA and the implications of base pair stacking in the double helix configuration.

### Step-by-Step Solution:

1. **Understanding the Structure of DNA**:
- DNA is composed of two strands that form a double helix. Each strand consists of a sequence of nucleotides, and each nucleotide contains a base (adenine, thymine, cytosine, or guanine).

2. **Base Pairing**:
- In the double helix, bases from one strand pair with complementary bases from the opposite strand (A with T, and C with G). This pairing is crucial for the stability and integrity of the DNA molecule.

3. **Base Stacking**:
- The question refers to the stacking of base pairs. In the double helix, the planes of the base pairs are stacked on top of each other. This stacking is due to hydrophobic interactions and van der Waals forces between the aromatic rings of the bases.

4. **Implications of Base Stacking**:
- The stacking of base pairs contributes significantly to the overall stability of the DNA structure. It minimizes the exposure of the hydrophobic bases to the aqueous environment, thereby enhancing the stability of the double helix.

5. **Identifying the Correct Answer**:
- The options provided are:
a) Anti-parallel nature to the double helix
b) Uniform length in old DNA
c) Uniform width throughout DNA
d) Additional stability to DNA
- Among these options, the stacking of base pairs primarily provides **additional stability to DNA**. Therefore, the correct answer is **option D**.

### Final Answer:
The plane of one base pair stacks over the other in double helix. This provides **additional stability to DNA**.

---