In DNA the linkages between different nitrogenous bases are

Options

A. peptide linkage
B. phosphate linkage
C. H-bonding
D. glycosidic linkage

Explanation

To answer the question regarding the linkages between different nitrogenous bases in DNA, we will analyze the options provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding the Structure of DNA:**
- DNA (Deoxyribonucleic Acid) is composed of two strands that form a double helix structure. Each strand is made up of nucleotides, which consist of a sugar, a phosphate group, and a nitrogenous base.

2. **Identifying the Types of Linkages:**
- The question asks about the linkages between nitrogenous bases. The options provided are:
- A) Peptide linkage
- B) Phosphate linkage
- C) Hydrogen bonding
- D) Glycosidic linkage

3. **Analyzing Option A: Peptide Linkage**
- Peptide linkages are formed between amino acids, not between nitrogenous bases. Therefore, this option is incorrect.

4. **Analyzing Option B: Phosphate Linkage**
- Phosphate linkages involve the connection of phosphate groups, which are part of the backbone of the DNA structure, not between the nitrogenous bases themselves. Thus, this option is also incorrect.

5. **Analyzing Option C: Hydrogen Bonding**
- In DNA, nitrogenous bases pair specifically: adenine (A) pairs with thymine (T) through 2 hydrogen bonds, and guanine (G) pairs with cytosine (C) through 3 hydrogen bonds. This hydrogen bonding is crucial for the stability of the DNA double helix. Therefore, this option is correct.

6. **Analyzing Option D: Glycosidic Linkage**
- Glycosidic linkages are formed between sugars and other molecules, typically in carbohydrates. Since nitrogenous bases are not sugars, this option is incorrect.

7. **Conclusion:**
- The correct answer to the question is that the linkages between different nitrogenous bases in DNA are **hydrogen bonds**.

### Final Answer:
In DNA, the linkages between different nitrogenous bases are **hydrogen bonding**.

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