Glycosidic bonds exist in DNA molecule between

• A. Sugar and phosphate
• B. Any two nitrogen bases
• C. Sugar and nitrogen base
• D. Purines and pyrimidines

Glycosidic bonds are specific connections found in nucleic acids like DNA. They play a crucial role in linking components of the DNA structure.

Understanding Glycosidic Bonds

In the context of DNA, glycosidic bonds form between:

• Sugar and nitrogen base

This means that each nitrogenous base (adenine, thymine, cytosine, or guanine) is attached to a sugar molecule (deoxyribose) through a glycosidic bond. This connection is essential for the overall structure and function of DNA.

Why Other Options Are Incorrect

• Sugar and phosphate: This bond is called a phosphodiester bond, not a glycosidic bond.
• Any two nitrogen bases: Glycosidic bonds do not connect nitrogen bases directly to each other.
• Purines and pyrimidines: These are types of nitrogen bases, but they do not form glycosidic bonds with each other.

In summary, the correct answer is C: Sugar and nitrogen base. This bond is fundamental to the structure of DNA.