Bonding between deoxyribose and base in pyrimidine nucleoside molecule is

Options

A. glycosidic linkage
B. ester linkage
C. hydrogen bonds
D. peptide linkage

Answer

To answer the question about the type of bonding between deoxyribose and base in a pyrimidine nucleoside molecule, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Nucleosides**:
- A nucleoside is composed of a nitrogenous base and a sugar molecule. In the case of DNA, the sugar is deoxyribose.

2. **Identifying the Components**:
- The nitrogenous bases can be categorized into two types: purines (adenine and guanine) and pyrimidines (cytosine and thymine).

3. **Focus on Pyrimidines**:
- Since the question specifically mentions pyrimidines, we will consider the bases cytosine (C) and thymine (T).

4. **Types of Bonds in Nucleotides**:
- There are different types of bonds in nucleotides:
- Hydrogen bonds: These occur between complementary bases (e.g., between adenine and thymine).
- Glycosidic linkage: This is the bond that connects the nitrogenous base to the sugar (deoxyribose).
- Phosphodiester linkage: This bond connects the sugar of one nucleotide to the phosphate group of another nucleotide.

5. **Identifying the Bond in Question**:
- The question asks specifically about the bond between deoxyribose and a pyrimidine base. This bond is known as glycosidic linkage.

6. **Conclusion**:
- Therefore, the type of bonding between deoxyribose and the base in a pyrimidine nucleoside molecule is glycosidic linkage.

### Final Answer:
The bonding between deoxyribose and base in a pyrimidine nucleoside molecule is called glycosidic linkage.

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